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Replacing Mercedes Benz Fuel Pumps
 
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Pelican Technical Article:

Replacing Mercedes Benz Fuel Pumps

Steve Vernon

Time:

2 hour2 hr

Tab:

$200

Talent:

**

Tools:

10mm socket, 8mm, 17mm, wrenches, Phillips-head screwdriver

Applicable Models:

 
Mercedes-Benz W124 (1986-95)
Mercedes-Benz W126 (1981-91)
Mercedes-Benz W201 (1984-93)

Parts Required:

Fuel Pumps (2), Rubber Hangers

Hot Tip:

Plan on replacing the hangers while you are in there

Performance Gain:

Proper fuel pressure

Complementary Modification:

Replace your hangers and check your lines

Your fuel pumps are an integral part of the fuel delivery system. A clogged or faulty pump can cause all kinds of problems, from a rough running engine to leaving you stranded on the side of the road. It is a good idea to change your pumps at the first signs of it going bad (trouble starting).

The W201 fuel pumps are located on the underside of the car, behind the rear driver side seat. You will need to safely lift and support your car. Please see our article on jacking up your Mercedes-Benz.

Once the car is safely supported, you will need to remove the plastic protective piece covering the fuel filter, accumulator and pumps. This is held in place by three 10mm plastic nuts. Remove these and place the plastic plate aside. You are going to be working around fuel so you should have proper eye protection and gloves on. Working on a cold car in a well ventilated area, begin by opening the gas cap to relieve pressure and disconnect the battery. There will be gas in both of the pumps that will spill out when you are removing them, just be prepared for it. Clean around the lines and fittings so as not to get debris into them while working.

The fuel assembly is suspended from the chassis by four rubber hangers or "donuts," as they are loosely called. It is a very good idea to replace these while you are doing the pumps, as they tend to dry out and crack with age. Just slip the old hangers off and replace them with new ones.

It is also a good idea to loosen the fittings on the pumps before you try and remove them from their supports. The two pumps are identical and can be used in either position. There is a banjo bracket on the output side and a hose fitting on the input. The banjo fitting is 17mm. Use two wrenches to remove the lines, one to hold the pump and the other to turn the fitting. On the input side you will need a Phillips head screwdriver to remove the hose clamp.

With the lines to the pumps removed undo the metal bracket that holds the pumps, filter and accumulator to the hangers. There are three Phillips-head screws that hold the bracket on, remove these and lower it down enough to remove the fuel pumps. The new pumps come with a plastic sleeve around the metal, do not remove this as it helps with absorbing shock and vibration. Install the new pumps according to the flow directions (the pumps will only fit on one direction, as the fittings are different). Make sure to install the brass washer between the banjo bolt, and snug everything up.

With everything in place, turn on the ignition and check for leaks. Turn off the ignition, reinstall the cover plate and you are good to go.

With the car safely lifted and supported remove the three 10mm plastic nuts (yellow arrows) holding the plastic protective cover on.
Figure 1

With the car safely lifted and supported remove the three 10mm plastic nuts (yellow arrows) holding the plastic protective cover on. Note: we have the exhaust off of the car for another project we are working on, but it does NOT need to be removed for this project.

With the cover removed you can see how the fuel flows from the tank to the engine.
Figure 2

With the cover removed you can see how the fuel flows from the tank to the engine. The main supply line comes from the tank and enters the first pump (yellow arrow), it exits the first pump (red arrow and enters the second pump (purple arrow), the fuel then exits the second pump (blue arrow) and is sent to the fuel filter. It enters the filter (green arrow) and exits the filter (orange arrow) and is sent to the engine. The other silver unit in the picture is the fuel accumulator and is used to maintain pressure in the system when the car is turned off. Use two 17mm wrenches to remove the banjo fittings. Hold the filter with one wrench while turning the fitting with the other. A Phillips head screwdriver is used to loosen the hose clamp.

Make sure you pay attention to the electrical connectors when installing.
Figure 3

Make sure you pay attention to the electrical connectors when installing. There is a definite positive and negative on each pump.

There are three Phillips head screws (yellow arrows) that hold the fuel pumps, filter and accumulator to the rubber hangers.
Figure 4

There are three Phillips head screws (yellow arrows) that hold the fuel pumps, filter and accumulator to the rubber hangers. Remove these screws and lower the bracket enough to remove the old pumps and install the new ones. Do not forget to install the rubber isolator between the pumps (red arrow).

It is a good idea to replace the rubber hangers (yellow arrows) that hold the fuel assembly when you are replacing the pumps.
Figure 5

It is a good idea to replace the rubber hangers (yellow arrows) that hold the fuel assembly when you are replacing the pumps. They get old, dry out and crack. They are not expensive and are a good insurance against a failure. One of ours on the project car was ripped through and two others where about to let go (insert lower left).

Install the new pumps, tighten everything up and then check for leaks by reconnecting the battery and turning the ignition on without starting the car.
Figure 6

Install the new pumps, tighten everything up and then check for leaks by reconnecting the battery and turning the ignition on without starting the car. If everything is good reinstall the cover and you are good to go.

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Comments and Suggestions:
James Comments: Found out the problem, my timing chain ripped apart my cam shaft sproctet, which is more jobs to do!!
October 21, 2017
  Followup from the Pelican Staff: Thanks for the follow up. We appreciate it.
- Nick at Pelican Parts
 
James Comments: By the way, the fuel pump is an after market one, it's called a facet posi flo, also, how much is the standard carb system, I'm from the UK!
October 8, 2017
  Followup from the Pelican Staff: Got it, thanks. - Nick at Pelican Parts  
James Comments: I'm having problems with my 1.8 190e, it's been of the road for a year and a half now, someone decided to put on kawasaki 660cc motor bike carbs instead of slandered, there not balanced either -.-, anyway, I had to change the head gaskets, but trying to start it up, there is no fuel going to the carbs, I've replaced the fuel pump and fuel filter, fuel running as normal through both, but seems like a blockage in the main fuel line to to carbs, looked online, and other people are saying check the fuel pump relay, I've took it out and ordered a new one... but can anyone tell me what other reasons why it won't start? I just want it back on the road!!! Miss it so much!
October 8, 2017
  Followup from the Pelican Staff: What is fuel pressure? if you have pressure and volume, the carbs may be plugged. - Nick at Pelican Parts  
James M Comments: Hello Nick, I have a 1989 300 SEL automatic, in the UK. The fuel pressure is low at the port of the fuel distributor for the sixth cylinder nearest to the driver. I have replaced the fuel distributor with an used unit. It is hard to start and misfires at that 6th cylinder when warm. Hope you can advise. Thank you,
September 23, 2017
  Followup from the Pelican Staff: Only cylinder 6? Odd it would do that with one. Has to be plugged or restricted. How are you testing, what are all pressure readings?- Nick at Pelican Parts  
Ike Comments: So does the 1990 190e 201 have two or one fuel pumps
July 25, 2017
  Followup from the Pelican Staff: Two electric fuel pumps (in series) which are located under the rear of the vehicle, supply a high rate of fuel to the injection system. - Nick at Pelican Parts  
Red 92D Comments: Yes. I can keep it from cutting out with the accelerator. I'll examine the idle control valve as suggested by you and let you know the result.

Thank you.
May 25, 2017
  Followup from the Pelican Staff: Let me know what you find. - Nick at Pelican Parts  
Red 92D Comments: I'm so jealous of your contributors with their big engines.

The road tax in Ireland is based on engine size pre 2008 and is expensive except for 30 year and older cars.

My 190 1.8 petrol when warm or hot the idling surges to about 1200 then
dies.

It restarts without any delay.. I replaced the fuel filter. As the car drives well
no hesitations or problems I suspect the fuel pump relay.


Any views, please.
Thank you.

Noel.
May 19, 2017
  Followup from the Pelican Staff: if you keep your foot on the accelerator, does the engine stay running? if so, likely an issue with the idle control system. - Nick at Pelican Parts  
retflyr Comments: If having fuel problems, suggest when changing the fuel filter, poor a little injector cleaner in the new filter before installing, the filter it is large and will hold a lot without spilling out. Why, because you may have water up the fuel rail in the injector distribution. This gives a good chance of absorbing water.
April 2, 2017
  Followup from the Pelican Staff: Awesome!!! Thanks for adding to this article, we appreciate your contribution. - Casey at Pelican Parts  
Dwc Comments: Is there a site related to other issues?
March 14, 2017
  Followup from the Pelican Staff: All 190e articles are here: http://www.pelicanparts.com/techarticles/MBZ_Tech_Index-190E.htm - Nick at Pelican Parts  
dwc Comments: Thanks Casey, I was confused by the difference between Bosch terminals and the new ones, plus I'm a rookie when it comes to Mercedes.

February 7, 2017
  Followup from the Pelican Staff: Haha me too!! - Casey at Pelican Parts  
dwc Comments: The small wire is tan and the largest wire is multi colored,the reason I asked is both terminal post are the same size on the new pumps and not on the old Bosch.
February 6, 2017
  Followup from the Pelican Staff: Tan is usually ground (-) - Casey at Pelican Parts  
dwc Comments: i,on a 93 mercedes 300e fuel pumps, is te largest wire the + or- ?
February 6, 2017
  Followup from the Pelican Staff: What color are the wires in question? Usually the largest is power and ground. - Nick at Pelican Parts  
Jo Comments: My 190e has black smoke at the muffler amd the spark plug tips are black.my fuel pressure regulator doent have vacuum leak.it is still possible my fuel pressure regulTor is defective?
January 10, 2017
  Followup from the Pelican Staff: You could have a leaking or stuck open fuel injector. I would check fuel pressure and volume, as well as resting pressure. - Nick at Pelican Parts  
Jerick Comments: Hi Nick, thannks for the great wrote up. I have a 1987 190e 2.6 that is leaking fuel from the second pump when running. Starting is hit or miss, sometimes it starts fine, sometimes it takes a couple tries. When it's running, it's fine, it idles a little low around 600 rpm and is a little incinsistent as I can feel a little fluctuation in rpm but barely noticeable. I know it would it makes sense to assume to change the pump, but I'm wondering if it would be the filter being clogged causing back pressure to the pump. Any advice? Thanks.
January 5, 2017
  Followup from the Pelican Staff: I would start with the pump, especially if it is leaking. Replace the filter as well. It would be a good idea to test pressure, volume and quality beforehand. - Nick at Pelican Parts  
Peter Comments: I have a W201, 2.6 petrol M103.940, currently not starting.
System pressure is oscillating between 2.5 - 3.0 bar every few seconds - clearly too low.
Does anyone have any pointers on how to isolate whether this is likely to be fuel pump, accumulator or fuel filter - or something else?
November 27, 2016
  Followup from the Pelican Staff: You can check volume from the pump, should deliver a pint in 30 seconds. If pressure is low and fluctuates the way you mentioned, it is likely the pump. - Nick at Pelican Parts  
orion Comments: Thank you for your answer. I have connected a pressure meter to the fuel line and checked the pressure. At a normal operational temperature stopped the engine. After a few minutes the pressure dropped suddenly. This situation told me that since the pressure dropped, the fuel vaporized in the fuel line and the pressure of the vapor pressed out the liquid fuel from the pump. This could happen only if the check valve is open in both directions. So, I have replaced the check valve. The engine starts normally in any situation. Thanks again.
November 20, 2016
  Followup from the Pelican Staff: Thanks for the follow up. - Nick at Pelican Parts  
Orion Comments: Hi Nick, my car is a MB 190E 1.8. Motor: 102910, manual. Warming up to a normal temperature and shut the engine down, within a few minutes it starts properly but beyond this interval it is very hard to start. As if the whole fuel system would be empty. After three or four attempts, it starts very slowly. Once started, it runs fine, all the functions idle, accelerating, high rev running are ok. The cold start is always without any problem.
I have checked the fuel accumulator, the temperature sensors, the cold start valve. Replaced the fuel filter, and also the injector valves.Shall I replace the check valve on the fuel pump?Please, advise me for any other actions.
October 31, 2016
  Followup from the Pelican Staff: Does the vehicle have fuel pressure when the hot restart issue is present? Check if pressure and volume are the same as when starting cold. - Nick at Pelican Parts  
wagi Comments: is there any replacement fuel pump beside bosch brand...
for 300e m103..
thx
October 26, 2016
  Followup from the Pelican Staff: There should be an alternative. Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
krleenm Comments: Thanks Nick! confirmed what I thought I will check that new pump pressure and the regulator.
October 20, 2016
  Followup from the Pelican Staff: Glad to help. let me know what you find. - Nick at Pelican Parts  
Krleenm Comments: Hi Nick, I have a W201 1984 2.3l i am having start and run problems, I have a fuel pressure gauge inline and am seeing 5.0 bar running and off. What should I be seeing? I did replace the fuel pump as the old one had failed but still have the start run problem. The fuel pump will only run during start as soon as I let the key go the engine dies. This happens intermittently. I'm leaning towards the fuel regulator, What do you think? There are no system leaks.
October 18, 2016
  Followup from the Pelican Staff:
Sounds low. You may have a weak pump or regulator issue.

Specs for your system:


System Pressures:
Cold or Warm 5.3 - 5.5 bar (77 - 80 psi.)
Residual Pressure, after 30 Min. 2.8 bar (40.5 psi.)
Lower Chamber Pressures:
Presure specifications given are in bar (psi) below previously measured system pressure.
Normal Operating Temp. 0.4 bar (5.8 psi.)
Idling 68°F (20°C) 0.4 bar (7.3 psi.)
Enrichment Pressures:
Measured at lower chamber port.
Acceleration Enrichment 20°C (68°F) min. 3.8 bar (55 psi.)
Full Load Enrichment (Normal Temp) approx. 0.4 bar (7.3 psi.)
Below measured acceleration enrichment pressure.
Deceleration Pressure:
Measured at lower chamber port.
Decel Pressure Must equal system pressure - Nick at Pelican Parts
 
Gemini Black Comments: I have a 90 420sel. Which wires are positive and negative on the fuel pumps.
October 3, 2016
  Followup from the Pelican Staff: Brown is usually negative. Check by testing with a DVOM first. - Nick at Pelican Parts  
SindelMech Comments: My friend's W201 needs to have the first pump between tank and second pump or between yellow and red arrows replaced.
Are the first and second pump the same part or different?
Like one low and one high pressure.
Congrats for the step by step article!
September 11, 2016
  Followup from the Pelican Staff: I think they are the same p[art. Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
taylor Comments: I have a 91 300e 2.6. How much fuel pressure should I have? How can I test the accumulator? Thanks, Taylor
August 13, 2016
  Followup from the Pelican Staff: Pressure is measured using a special adapter kit that allows fuel to flow during the test. Accumulator is tested along with the system using the info below. Your tester should have instructions on how to use it.

System Pressures:
Cold or Warm 5.3 - 5.5 bar (77 - 80 psi.)
Residual Pressure, after 30 Min. 2.8 bar (40.5 psi.)
Lower Chamber Pressures:
Presure specifications given are in bar (psi) below previously measured system pressure.
Normal Operating Temp. 0.4 bar (5.8 psi.)
Idling 68°F (20°C) 0.5 bar (7.3 psi.)
Enrichment Pressures:
Measured at lower chamber port.
Acceleration Enrichment 20°C (68°F) min. 3.8 bar (55 psi.)
Deceleration Pressure:
Measured at lower chamber port.
Decel Pressure Must equal system pressure


- Nick at Pelican Parts
 
Tommy123 Comments: I have a 190E 2.0 1992 W201 MB.My vehicle is a RHD The fuel pump is not working however when i toook it oout of the car and tested it, it work perfectly fine. I also then check both front and rear relays which is located behind the firewall at the back of the battery. i discovered that the front relay smelt burnt and the back was in good condition. The # of the front relay is 002 545 05 05 and 4Zyl.KVS Kickdown 12V. And the rear relay is 002 545 12 05 and 4Zyl.KLI. Can you tell me the functions of these 2 relays and are they related to the fuel pump? Both relays carry 9 pins. Do you have in stock and whats the cost?
August 10, 2016
  Followup from the Pelican Staff: 002 545 12 05 is the a/c system relay. http://www.pelicanparts.com/More_Info/0025451305.htm ?pn=002-545-13-05-INT


002 545 05 05 is the fuel pump relay. Also showing up pas an a/c relay.

Give The Pelican Parts parts specialists a call at 1-888-280-7799.
- Nick at Pelican Parts
 
Jim1990 190e 2.6 Comments: My cold start problem: I have to turn key on about 6 times, and hear the pumps priming each time. Then crank for 5 seconds. Fires and dies. On about the 3rd try the engine starts and idles roughly at 500 rpm. Will clear up in about 2 minutes, then can drive away and runs great. I can also drive away with it idling rough and it clears up within 1/8 mile. OK on warm restarts. Fuel pumps?
May 24, 2016
  Followup from the Pelican Staff: I can't help without knowing what is missing from the system when you are trying to start it. When your engine doesn’t start you’ll want to check the basics. Check spark, fuel injector pulse and fuel pressure, volume, quality and engine compression. Are there any fault codes? Once you figure out what is missing, it will be easier to diagnose.
- Nick at Pelican Parts
 
Matt Comments: Trying to diagnose a 95 E320 sedan that will not start. Can you advise me on the correct fuel pressure for a properly operating fuel system
May 14, 2016
  Followup from the Pelican Staff: Here's what I found:

Closed Throttle with Vacuum 3.2 - 3.6 bar
Closed Throttle without Vacuum 3.7 - 4.2 bar
Rest Pressure After more than 30 minutes. 2.5 bar
- Nick at Pelican Parts
 
Mark C Comments: Vehicle: 1990 MB 190E w/ 10,600 original miles. Problem: There is a fuel leak from the pump/filter area. Small drip of fuel only but enough to smell it. The drip appears to be from one or more connections not from the lines or hoses. Could it be a leak at the connection/washers? Is there s kit to replace all the washers and the two doughnut hangers?
April 22, 2016
  Followup from the Pelican Staff: I would assume the fitting or seals is leaking. I would replace the seals, then recheck it for a leak. Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
bmanx420 Comments: Sorry I have a 1992 400e and it's leaking from the banjo fitting on the blue arrow, what parts do I need to replace everything here and where do I clamp to stop fuel from leaking
February 29, 2016
  Followup from the Pelican Staff: It could be the sealing washer of the fuel line. You will have to wipe it down as it leaks to see exactly where the leak is coming from. Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
bmanx420 Comments: OK so my fuel systems leaking where the blue arrow is I'm not sure what part it is and I know it doesn't come with the fuel pump also where do I clamp so no fuel leaks while I'm removing and installing new pumps,
February 29, 2016
  Followup from the Pelican Staff: It could be the sealing washer of the fuel line. You will have to wipe it down as it leaks to see exactly where the leak is coming from. Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
dedrock Comments: I have a 1992 Mercedes 190e 2.6L I am about to change my fuel pump. The first thing I need to know is do I have to change both pumps and if not how do I know which one has to be replaced? Secondly I would like to know if this sequence of events is correct: This is how I understand it should go: 1. Remove the banjo fittings and unscrew the input clamp. 2. Use a vice grip to stop gas flow from tank. 3. undo the 3 screws to release the harness.
4. Remove the old pump and replace with the new one making sure all the washers and seals are in place and well tightened. 5. test for leaks by turning on the ignition key, but don't start the engine. Please let me know if this is correct?
February 10, 2016
  Followup from the Pelican Staff: Clamp hose first, then begin removing things.

The rest of your order is OK.

You would have to test pump output to determine which is faulty.


Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Steve Comments: Ive changed my fuel system from a fuel distributor system to a carburetor.however i didnt put a manual pump but electrical pump. The car runs ok few mins later develops hiccups and goes off.cant accelerate coz fuel in the carburetor is not enough or is too much.how do i connect the electrical pump?
January 27, 2016
  Followup from the Pelican Staff: You didn't mention what vehicle you have. First, check the volume and pressure spec for your carb. Then test at the carb to see if it is within spec. - Nick at Pelican Parts  
Billy Comments: Does my car a w124 E320 1995 model have a fuel accumulator. My car take a few times to start when its hot. Its perfectly fine if it is cold.
December 14, 2015
  Followup from the Pelican Staff: Yes, it should. - Nick at Pelican Parts  
Dot Comments: Dorothy senior again. Months later. 190e2.3 still leaks around and under by passengers back tire. Two leaks. Can use only little gas at a time when empty 20. 00 of plus. If more it then leaks.. Engine is getting older.
Thank u .thank you. Appreciate very much Dorothy
November 18, 2015
  Followup from the Pelican Staff: You either have a fuel line, filter, pump or tank leaking. Have it checked and do not drive the vehicle. - Nick at Pelican Parts  
ace Comments: have a 1990 190E 6cyl Mercedes....got it from charity auction...It would not pump fuel, but would run on fuel poured in by air filter...pumps would run if jumpered but not start car. was told to replace fuel relay...no help...was told to drain tank and replace filter...did that gas was varnish color n smelled old ,now can hear pump kick on and off when turning over engine, but still not starting...please help
November 9, 2015
  Followup from the Pelican Staff: I can't help without knowing what is missing from the system when you are trying to start it. When your engine doesn’t start you’ll want to check the basics. Check spark, fuel injector pulse and fuel pressure, volume, quality and engine compression. Are there any fault codes? Once you figure out what is missing, it will be easier to diagnose.
- Nick at Pelican Parts
 
bilbo Comments: I have replaced the fuel filter on my 1989 300ce, When I turn key I can hear pump prime for 2 seconds... but car will not start,cranked it till the battery went flat, recharged battery, same again, is it possible to have an air lock?
October 22, 2015
  Followup from the Pelican Staff: Fuel filter may be installed backward. When your engine doesn’t start you’ll want to check the basics. Check spark, fuel injector pulse and fuel pressure, volume, quality and engine compression. Are there any fault codes? Once you figure out what is missing, it will be easier to diagnose. - Nick at Pelican Parts  
RHubner Comments: Hi, I have a friend with a 1987 190 E 2.3 that has high fuel pressure, 6.4 bar on the cold start injector to be exact.
The car has been through a lot of shops already, and I suspect the fuel pressure regulator might have been ex-changed with one from a V8 model. The number on the regulator is as follows: 0 438 161 013.

Is my hypothesis plausible? And if so, do you have the right pressure regulator for this car? It has the M110.985 engine chassis: W201 024

Thanks in advance,

Rafael from Brazil.
October 19, 2015
  Followup from the Pelican Staff: You can only exchange the part if the part numbers are identical. To be sure, Give our parts specialists a call at 1-310-626-8765 - Nick at Pelican Parts  
pom Comments: I have two wire connections to the fuel pump on a Mercedes 190e 1986 which wire is positive.at the moment both showing live connected wires are
October 18, 2015
  Followup from the Pelican Staff: I don't have the wiring for that model. Are you reading taken with the connector plugged in or unplugged? - Nick at Pelican Parts  
Manny Comments: How come I keep sending comments and I get no responses?
October 4, 2015
  Followup from the Pelican Staff: You are not entering an email, so the responses aren't getting to you. - Nick at Pelican Parts  
Manny Comments: I have a 1992 mercedes 190e 2.3 my cylinder to where I put my key to start my car is locked. I tryed turning my wheel and turning my key at the same time. To no avail. Can someone help?
October 2, 2015
  Followup from the Pelican Staff: I replied to your other comment. - Nick at Pelican Parts  
manny Comments: hello everyone.i own a 1992 Mercedes 2.3.it stops running when I stop at a red light or when I park my car.can it be the fuel pump?
September 30, 2015
  Followup from the Pelican Staff: I replied to your other comment. - Nick at Pelican Parts  
Manny z Comments: Hello everyone I have 190e 1992 Mercedes Benz it stops especially on red lights and when I park my car.can it be the fuel pump?or something else?
September 30, 2015
  Followup from the Pelican Staff: I replied to your other comment. - Nick at Pelican Parts  
Manny Comments: Hello everyone I have a 190e 2.3 Mercedes Benz.it stops running especially on red lights and when I move forward and backward when I park my car.can it be the fuel pump?or something else?
September 30, 2015
  Followup from the Pelican Staff: I can't help without knowing what is missing from the system when you are trying to start it. When your engine doesn’t start you’ll want to check the basics. Check spark, fuel injector pulse and fuel pressure, volume, quality and engine compression. Are there any fault codes? Once you figure out what is missing, it will be easier to diagnose.
- Nick at Pelican Parts
 
stian Comments: hi. Thanks for the writeup, this site is a great resource. I just did this job incl filter and wanted to add, if of use to anyone, my banjo joints leaked like h#ll after reassembly. Reason was having reused the copper washers not to be cheap, just didnt have new ones.. Took it apart, again, and tempered and quenched the washers, reassembled, and problem gone. Easier even and for ref washers are part number N007603012110 from MB each. I dont remember the inner diameter sorry, need 5. The rubber hangers are pn A1244780082 ea. need 4. all the best
September 24, 2015
  Followup from the Pelican Staff: Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 
crjohn Comments: OK you indicate i should replace the fuel pump rubber hangers when i change the 2 pumps for a 1993 E320 2.6 , but where can i buy them, also do i have to remove the fuel tank to replace the fuel tank strainer thanks in advance you people are great
September 23, 2015
  Followup from the Pelican Staff: Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
manny Comments: thank you frank ill look into it!!
September 17, 2015
  Followup from the Pelican Staff: let us know what you find. - Nick at Pelican Parts  
Frank Comments: Manny, my two sense: First, don't drive the car with a fuel leak! You got to get underneath and look. Lift and support the vehicle. Remove the cover from the fuel pumps as described above. Turn the ignition key on but DO NOT turn the engine over on. This will activate the fuel pumps and check for leaks. Check the surrounding lines and clamps attached to the fuel pumps and the accumulator. If no leaks visible, at least you'll know its not coming from the fuel pump area. Also, check the hard fuel lines and make sure they are not pinched/damaged from hitting speed bumps or freeway debris. Second, is to check the line going to the fuel tank and the fuel tank filter that's located at the bottom of the tank. Checking the fuel tank and perhaps removing it is a weekend job in it's self. Good luck!
September 13, 2015
  Followup from the Pelican Staff: Thanks for the input on this one. We appreciate the help.
- Nick at Pelican Parts
 
Manny Comments: I have a 1992 190e 2.3 Mercedes. It has fuel leaking from the back. can it be the lines? or the actual fuel pump? Can someone help?
September 12, 2015
  Followup from the Pelican Staff: Could be the fuel lines or the filter, inspect the filter / pump area for leaks. - Nick at Pelican Parts  
Frank Comments: I own a 1993 190E 2.6 and have to assist my morning start by pumping the accelerator pedal. I'm thinking of replacing my fuel pumps,accumulator and fuel filter. Hopefully that will fix the problem. Question? Do you need to depressurize the fuel line before replacing any of the fuel pumps,accumulator and/or fuel filter? If so, how do you approach that process? Thanks.
September 9, 2015
  Followup from the Pelican Staff: Remove the fuel tank filler cap. (Depressurizes the fuel tank). Then when you crank the lines, cover them with a rag to catch the escaping fuel. - Nick at Pelican Parts  
The Fixer Comments: Hey Guys,
I bought an after market fuel pump for my 1986 Mercedes 560 SEL W126 body. I made sure the part # is the same as the original one, but when I came to install it, I found that the receptacle on the part is too big onto the fuel line. Is there an adapter for the fittings, that can make the part work? Also I hadn't realized at first that the car has two pumps, should I replace both if there's a fuel pump issue? I appreciate very much your assistance in this matter. Thanks, Matt
August 11, 2015
  Followup from the Pelican Staff: No adapter that I know of. Check with the place you got the pump, maybe it is universal. - Nick at Pelican Parts  
fatBilly0 Comments: A mechanic tells me that the fuel pump in my 2006 MB/CLK 500 is an integral part of the fuel tank, and is available only as a single unit. . Changing the pump can cost up to $3000. Is this true?
July 28, 2015
  Followup from the Pelican Staff: The pump is integrated into a module that sits in the fuel tank. it is accessed through a panel under the rear seat cushion. I would call around for a few more estimates. - Nick at Pelican Parts  
mbknurt Comments: My new fuelpump will not run, do it have an electric problem? Can't find power to the pump.
July 16, 2015
  Followup from the Pelican Staff: It could. Is it missing power and ground? What type of vehicle? - Nick at Pelican Parts  
Ace Comments: Please does changing the fuel pump of a w201 make the car fuel efficient like a w202? Bcs i wanna buy me a w201 but scared of fuel cost. Thanx
April 9, 2015
  Followup from the Pelican Staff: No, fuel pump replacement will not change fuel economy, unless pump is faulty and delivering too much fuel volume. - Nick at Pelican Parts  
Bruno Comments: When the line from the fuel tank is removed from the pump will the entire fuel tank empty out through the disconnected fuel line?
February 15, 2015
  Followup from the Pelican Staff: I remember that being the case. If that line is off, the tank will drain. - Nick at Pelican Parts  
Norbert Comments: 1984 190E European model has only one pump... Is it the same as a USA model?
January 5, 2015
  Followup from the Pelican Staff: I don't know, I haven't seen the euro models. Give our parts specialists a call at 1-888-280-7799. They can help you find the right part.
- Nick at Pelican Parts
 
Dottie. A senior Comments: Hi, dorothy here had fuel pump installed6 mo ago in 190 e 2.3 mercedes. Now leaks place said hoosegow cramped while filling gas. Opened hose. Vacuumed I think. 3 days later leaks like faucet. Stuck in valley . They removed and said the first just was soldered the leak and no good. I was told it was a new one installed!yes I'm mad,does tank go I trunk or side of the car? Seemed heavy back there. Help. Tommorow am another going in . I'm scared and won't sleep. Can you help me tonite? Thank you so much.
January 5, 2015
  Followup from the Pelican Staff: I'm having a hard time following what your issue is. A fuel leak? If so, certainly do not drive the vehicle. Have it towed to a shop. There could be a faulty hose, the nipple for the hose or the tank itself could be leaking. - Nick at Pelican Parts  
Sally Comments: Fuel pump 190E. Where is it on the car? Does it have access panel under seat or in trunk?
November 5, 2014
  Followup from the Pelican Staff: Under a cover, left side of vehicle, attached to underbody, in front of left rear wheel. See attached photo. - Nick at Pelican Parts
Sally Comments: Location of fuel pump on car. Under seat, in trunk?
November 5, 2014
  Followup from the Pelican Staff: Under a cover, left side of vehicle, attached to underbody, in front of left rear wheel. See attached photo. - Nick at Pelican Parts
yooyoo1 Comments: hi Nick
looking for the rubber hangers . there are 4 of them which support the whole assembly.

where can i get them ?
thanks
September 10, 2014
  Followup from the Pelican Staff: Give our parts specialists a call at 1-888-280-7799 and they can get them for you.
- Nick at Pelican Parts
 
Cesar Comments: Can I replace both 3 BAR pumps by one 6 BAR?
September 3, 2014
  Followup from the Pelican Staff: No. - Nick at Pelican Parts  
Lsmalley Comments: One thing that was forgotten in this write up, or maybe I did something wrong when I replaced m pumps, but the clamping of the main fuel hose is an absolute necessity. I changed out my pumps and when I loosed the clamp to the main hose going to the first pump all the gasoline began to gush out. I had to plug it with my finger and use a pair of vice gripis to clamp the hose.
August 31, 2014
  Followup from the Pelican Staff: Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 
AEROBIX Comments: PLS HOW MUCH CAN I GET BENZ 230 FUEL PUMP IN LADIPO MARKET?
July 18, 2014
  Followup from the Pelican Staff: I don't know what that market is. Give our parts specialists a call at 1-888-280-7799. They can help you find the right part.
- Nick at Pelican Parts
 
Sheryl Comments: Will this work for a C300 also?
June 16, 2014
  Followup from the Pelican Staff: This tech article applies to:

W124 (1985-1995)
W126 (1979-1991)
W201 (1982-1993) - Nick at Pelican Parts
 
ismail Comments: Thanx nick the washers is worn,
April 22, 2014
  Followup from the Pelican Staff: OK. They can be replaced. Give our parts specialists a call at 1-888-280-7799. They can help you find the right part.
- Nick at Pelican Parts
 
ismail Comments: Good day, I replaced my fuel pump on my 190e 124 series recently, but there's a leak, wat size washer does it take, cause I replaced the washers twice already an its still leaking.please advise thanx.
April 21, 2014
  Followup from the Pelican Staff: If the connection is leaking. The washers, bolts or lines could be worn. Give our parts specialists a call at 1-888-280-7799 and they can help figure out which part or repair kit you need.
- Nick at Pelican Parts
 
James Comments: I have a strong smell of gas inside my 1991 TE Mercedes. Any ideas where it's coming from to know what replacement is necessary.
April 14, 2014
  Followup from the Pelican Staff: A fuel leak? Likely somewhere in the front, near engine. - Nick at Pelican Parts  
malbuddy Comments: Greatly appreciate your DIY tutorials, thank you ! A couple questions. If replacing all at once, accumulator, both pumps and filter, is there anything we should do to help the car start after replacement? Also, I am unable to find the rubber 'hangers'. Where can these be purchased?
January 29, 2014
  Followup from the Pelican Staff: Just cycle the key a few times before cranking the engine. Give our parts specialists a call at 1-888-280-7799. They can help you find the right parts. - Nick at Pelican Parts  
woowoo Comments: I am really interrestened
December 13, 2013
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 

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Page last updated: Fri 11/17/2017 02:29:18 AM