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Pelican Technical Article:

Fuel Filter Replacement

Time:

1 hour1 hr

Tab:

$40

Talent:

*

Tools:

Phillips screwdriver, vise grips, 10mm socket

Applicable Models:

Mercedes-Benz E320 (1996-97)
Mercedes-Benz E420 (1997)

Parts Required:

fuel filter

Hot Tip:

Use caution as you will be working around gasoline

Performance Gain:

Car runs better

Complementary Modification:

Replace Fuel Pressure Regulator

Changing the fuel filter on the Mercedes-Benz W210 is a pretty easy job provided you take the time to make it a safe job. The first step in replacement is to prep the car. Remove as much gasoline out of the car as possible. The way I like to accomplish this is to get some long fuel hose and place it down the fuel filler hole, hook up a small battery operated carburetor fuel pump, and pump from one car to another. An alternative approach would be a gasoline hand pump available at most local auto parts stores. The bottom line is to get as much gasoline out of the tank as possible.

Another important thing to remember - always disconnect the battery when working near the tank - you don't want any accidental sparks from any electrical connections. Some additional warnings too:

  • Always have a fire extinguisher handy in case an emergency arises.
     
  • Gasoline is highly flammable. When working around fuel and fuel line connections, don't disconnect any wires or electrical connections that may cause electrical sparks.
     
  • Always remove the gas cap to relieve any pressure in the tank prior to working on the fuel system.
     
  • Do not use a work lamp when working near fuel or fuel tanks. If you need some light, use a cool fluorescent lamp and keep it far away from the pump.
     
  • Gasoline vapors are strong, harmful, and can cause you to become drowsy and not think straight. Always perform work in a well-ventilated area with plenty of fresh air blowing through.
     
  • Always disconnect the battery when working on the fuel system. Leave it disconnected for at least 30 minutes to allow any residual electrical charge in components to dissipate.
     
  • Keep plenty of paper towels on hand, and wear rubber gloves to prevent spilling gasoline on your hands
     
  • Be well grounded - don't do anything that will create static electricity. Keep all cell phones and pagers a safe distance away.

Shown here is a new filter for the Mercedes W210.
Figure 1

Shown here is a new filter for the Mercedes-Benz W210.

Jack up the rear of the car and secure it on jackstands.
Figure 2

Jack up the rear of the car and secure it on jackstands. Underneath on the driver's side right in front of the axle is a protective cover held on by three 10mm nuts (green arrows). Remove these nuts and carefully lower the cover out of the way.

Here is the filter and fuel pump assembly under the protective cover.
Figure 3

Here is the filter and fuel pump assembly under the protective cover. The fuel filter is held in place by a band which also secures the fuel pump. You'll need to remove the Phillips head screw (purple arrow) to loosen the band. There are also two hose clamps (green arrows) holding each fuel line to both sides of the fuel pump. DO NOT loosen these just yet.

Before you remove the fuel lines from the filter, you'll need to bleed off the fuel pressure in the line or else fuel will spray everywhere.
Figure 4

Before you remove the fuel lines from the filter, you'll need to bleed off the fuel pressure in the line or else fuel will spray everywhere. A good way to do this is to remove the fuel pump relay, start the engine and then let it run until it dies. This will bleed off any pressure in the line.

Use vise grips to clamp off the fuel lines on both sides of the filter.
Figure 5

Use vise grips to clamp off the fuel lines on both sides of the filter. This prevents a massive fuel leak when you disconnect the lines from the filter. You want to make sure the vise grips are good and tight, but not so tight that you puncture the line. The key here is to make sure no fuel gets out. You'll want to have a drain pan below the filter, as there will be some leakage out of the filter itself. It's also a good idea to have a fire extinguisher nearby just in case.

Once secure, loosen the hose clamps and pull the fuel lines off the old filter.
Figure 6

Once secure, loosen the hose clamps and pull the fuel lines off the old filter. Let the fuel drain out of the old filter and remove the long Phillips screw in the center of the bracket. Once the lines are off, slide the old filter out of the bracket (green arrow).

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Comments and Suggestions:
Marcie Comments: My Mercedes E320 200 was smelling like gas, my father found that the hoses close to the filter were very old, not liking but old, he replaced the fuel filter and the hoses, now the aut will not start, and it is not the battery, thanks for your help, some say is the pressure, other the gas pump
March 12, 2016
  Followup from the Pelican Staff: The filter could be installed backward, or Could be an issue with the fuel pump. I would perform a fuel delivery system test. Check fuel pressure, volume and quality.
- Nick at Pelican Parts
 
big bad benz Comments: U rock thanx for app saved me tons o cash
March 11, 2016
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 
Mac Comments: My 300e takes about 15 seconds to start turning over and over for at least that length of time sometime longer. After it starts it runs very good normal. Could this be a fuel filter problem clogged up?
March 3, 2016
  Followup from the Pelican Staff: Could be an issue with the fuel pump. I would perform a fuel delivery system test. Check fuel pressure, volume and quality.
- Nick at Pelican Parts
 
Grump Comments: Thanks for the diagnostic steps.

Gauge will of course measure pressure. Volume I believe would be from a timed pump from somewhere into a measuring vessel. I forgot how to make my WIS software open up on the virtualbox, so could you please guide us on where to tap the fuel and what time and what volume of fuel should be pumped?

Thank you!
March 3, 2016
  Followup from the Pelican Staff: Volume is tested through the same port. You will have to get the spec for your model from a repair manual. The test port should be on the fuel rail.

I would grab a repair manual. It will have the procedure and special tools..

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
Grump Comments: Sitting by the road waiting for a tow... Behavior is fuel starvation. And no fuel odor at tailpipe when it tries to start then dies. Plan to pull filter & blow test it first Been there, done that with several cars before.. Or is there a reason to unscrew whatever fitting at the fuel fail & check for squirt there first??? '96 C280.

Sounds like fuel pump turns on with key but it might be louder, more rough sounding than I remember. Is there a test/value of fuel pumped at key on I can test with a line at the fuel rail? I have graduated cylinder & have looked at x ml of fuel in y seconds before.
March 3, 2016
  Followup from the Pelican Staff: Don't check fuel by squirting it out of the test port, that will not prove the pump ood or bad. You have to test using a gauge. 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  
Shane fleming Comments: E320 1997 no fuel pressure at the rail checked for spark and used easy start to ride some of the problems car would start then die out leading me to fuel system pump filter relay don't know how to check injectors or even if there is a point seen as no pressure at the rail should I go a change filter and pump
February 15, 2016
  Followup from the Pelican Staff: I am having trouble deciphering the sentence. If you are asking if you should replace the fuel pump; if you have no pressure and the pump had power and ground, yes. replace it. - Nick at Pelican Parts  
danny Comments: my mercedes 300e 1986 takes several crank before it start and when the engine start, i heard noise on the rear right side. ounce the engine warmup easy to start but the noise still there.
January 26, 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  
Pin2 Comments: Is there a Fuel Pump Relay for 1997 E320? I looked everywhere under the hood, under the rear seat, dash but can't locate it.
October 28, 2015
  Followup from the Pelican Staff: I recall the relay being in the relay box, in the left of the engine compartment. - Nick at Pelican Parts  
memo Comments: I have 1998 e320 with 150000 miles is run good in till 15 to 20 miles then engen stop then let cool off for 1hr and start I wonder is the fulfilter
September 20, 2015
  Followup from the Pelican Staff: Could be a sensor or fuel pump. 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  
Vi Comments: I have a 200e 1990 model Benz, where can I find the fuel filter?
August 25, 2015
  Followup from the Pelican Staff: From Pelican Parts: Give our parts specialists a call at 1-888-280-7799. They can help you find the right part.
- Nick at Pelican Parts
 
chaz Comments: where is the fuel filter on a 1995 c280
July 24, 2015
  Followup from the Pelican Staff: Right rear of vehicle, just in front of the rear right tire. behind a protective cover. - Nick at Pelican Parts  
Boady Comments: Is the fule pump/filter accesible under the drivers side rear seat on a 91 300E?
July 4, 2015
  Followup from the Pelican Staff: No, it is mounted beneath the vehicle on the right side, behind a plastic cover. - Nick at Pelican Parts  
Smartchoice Comments: How do I check fuel controls to pick values?
June 12, 2015
  Followup from the Pelican Staff: Check fuel control values using a Mercedes-Benz scan tool. Look for the values in the live data stream. - Nick at Pelican Parts  
smartchoice Comments: Yes it looks normal but I have not tampered with the original differential .... Is there a need to replace the differential with another that may give more power to the drive shafts?
June 10, 2015
  Followup from the Pelican Staff: Normal - what are the values?

If RPM is high sue to diff ratio, you can improve fuel economy changing it. If there is apart available. - Nick at Pelican Parts
 
Jojo Comments: I found the fuel pump relay is in the trunk right side panel above the batt. I do have an 8 cil. 5.0. Litter 93 500 sl. Sport
Thanks a million for ur help.
Now I have another. Q. My convertible top don't work with d electric power d light on d switch just blink when I hit d bottom n the roll bar doesn't move
June 4, 2015
  Followup from the Pelican Staff: Thanks for the follow up, my repair information was wrong.

if the light is blinking there is a fault. Could be a microswitch or latch. - Nick at Pelican Parts
 
jojo Comments: where is the fuel pump relay in a 1993 500 sli have no power to the pump test pump ok I dump fuel in the trotle and it runs but shut down once fuel is burn I can't find the fuel pump relay help plz.
June 3, 2015
  Followup from the Pelican Staff: Assuming you have an 8-cylinder engine, it is below the rear seat cushion. - Nick at Pelican Parts  
smartchoice Comments: its a reduction in engine size....M104 is six cylinders which I removed and inserted the M111 four cylinders engine...so its a downgrade
June 1, 2015
  Followup from the Pelican Staff: Ah, my mistake. Possible small engine big car then. Have you check if fuel control looks normal? - Nick at Pelican Parts  
smartchoice Comments: replaced my m104 with am m111 engine using a PMS ecu now I get 6.3km to a liter... any suggestions to improve mileage?
May 31, 2015
  Followup from the Pelican Staff: Could just be the increase in engine size. Have you check if fuel control looks normal? - Nick at Pelican Parts  
Ms patt Comments: Love this site it has everything in one spot

Thanks a million
Ms patt
February 6, 2015
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help. - Nick at Pelican Parts  
Chuck Comments: Hi my name is chuck .I was ask you about where is fuel pump relay on mercedes e320 1997 before.And you said in electronic box in the trunk.I try to find it but no electronic box or fuse box in the trunk.And now I found out that it is under the hood on the passenger side call k 40 that have 5 connection to it.My question is.Do I need to disconnect all 5 of them or just one and which one is it to release fuel pressure ? Because I need to change the fuel filter. Thank you very much.
January 8, 2015
  Followup from the Pelican Staff: I am not sure what market your vehicle is from. If it is not from the US, I cannot help as I don;t have any info for that vehicle. - Nick at Pelican Parts  
Chuck Comments: Where is fuel pump relay on 1997 e320?
December 31, 2014
  Followup from the Pelican Staff: Should be in the rear electornic box, in the trunk. Likely attached to the side panel. Going by memory. - Nick at Pelican Parts  
Mrs. Veney Comments: I have a 1997 mercedes e320 and I was wondering why it jumps while idling. We are thinking its the fuel filter.
November 20, 2014
  Followup from the Pelican Staff: Is the check engine light on? Sounds like an engine misfire. I would check spark, fuel and compression on all cylinders.
- Nick at Pelican Parts
 
dwainthebathster Comments: The filter and pump are on the right rear of the car up behind the fender well and the black plastic cover appears to be quite difficult to lower to change. Any suggestions?
March 19, 2014
  Followup from the Pelican Staff: Remove the cover, that should improve access. - Nick at Pelican Parts  
abel Comments: How do remove the clamps on the gas filter
December 22, 2013
  Followup from the Pelican Staff: Unscrew them using a nut driver or small screwdriver. - Nick at Pelican Parts  
al Comments: where is fuel pump relay on 1997 e420
July 15, 2013
  Followup from the Pelican Staff: As I recall, that is a function of the
K40 relay unit MB# 2105400072
http://www.pelicanparts.com/cgi-bin/ksearch/pel_search.cgi ?SUPERCAT_FLAG=Y&make=MBZ&please_wait=N&forumid=&threadid=&command=DWsearch&description=2105400072&x=13&y=9

Located in the passenger side engine compartment instrument box.
-whunter-
 
maini51 Comments: Great many thanks
May 27, 2013
  Followup from the Pelican Staff: You are welcome. Very happy this diy helped you.
- whunter
 

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