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Pelican Technical Article:

BMW Fuel Pump Testing

Nick Czerula

Time:

3 hours3 hrs

Tab:

$300

Talent:

*****

Tools:

Phillips & flathead screwdriver, 10mm socket, DVOM, Test light

Applicable Models:

BMW 325i Sedan (2006)
BMW 325xi Sedan/Wagon (2006)
BMW 328i Coupe/Conv (2007-13)
BMW 328i xDrive Coupe (2009-13)
BMW 328i xDrive Sedan (2009-11)
BMW 328i xDrive Wagon (2009-12)
BMW 328i/xi Sedan (2007-11)
BMW 328i/xi Wagon (2007-12)
BMW 328xi Coupe (2007-13)
BMW 330i/xi Sedan (2006)
BMW 335d/i/xi Sedan (2007-11)
BMW 335i xDrive Coupe (2009-13)
BMW 335i xDrive Sedan (2009-11)
BMW 335i/is Coupe/Conv (2007-13)
BMW 335xi Coupe (2007-13)

Parts Required:

Fuel pump, fuel pump sealing O-ring

Hot Tip:

Check and clear fault codes when done using a BMW scan tool.

Performance Gain:

Restoring engine performance

Complementary Modification:

Replace fuel pump if faulty

A faulty fuel pump can cause poor engine performance and hard starting problems. When they fail completely you may be left with an engine that doesn't start. If you suspect your fuel pump has failed, you can confirm the fuel pump is received the correct voltage when commanded ON by the fuel pump control module using a digital volt ohm meter (DVOM). If the correct voltage is present, but pump does not activate, it is likely faulty. Use the DVOM in conjunction with a wiring diagram to determine the correct terminals for testing. You can access the fuel pump electrical connector and terminals under the rear seat cushion, below an access panel. On E90 models, a fuel pump control module is used in place on the fuel pump relay. The fuel pump module can be activated for testing using a BMW scan tool, if you do not have access to a BMW scan tool, attempting to start the vehicle will also activate the fuel pump control module, the module will send control voltage to the pump. Instead of seeing what we are used to, battery volts supplied to the fuel pump, we now see a voltage dependent on fuel supply demand from the DME. When testing, I usually see about 10 volts being sent to the fuel pump. In this tech article, I will go over how to test fuel pressure and volume. You will need an assistant to press the Start Stop button during the testing procedures.

The fuel pump is located in the right side of the fuel tank.

Pressure testing:

Remove engine cover over fuel injectors. See our tech article on engine cover removing.

First thing you have to do is remove the fuel test port cap.
Figure 1

First thing you have to do is remove the fuel test port cap. (green arrow)

Next, install the fuel pressure gauge connecting line (green arrow).
Figure 2

Next, install the fuel pressure gauge connecting line (green arrow). Be sure that all test hoses are installed and routed properly. Then install the fuel pressure gauge.

Next, start or attempt to start engine.
Figure 3

Next, start or attempt to start engine. Fuel pressure should be 5 bar (72.5 psi). Once you test pressure. Recharge fuel system by cycling key or running fuel pump, note fuel pressure. Then allow fuel system to sit under pressure for 15 minutes. Pressure should drop no more than 0.5 bar in that time period. If it drops you could have a faulty fuel pump check valve or a leak in the fuel system. Electrical testing Working in rear of vehicle interior; grab corner of rear seat cushion and pull up to detach locking tabs. See our tech article on Seats, removing.

Once you have removed the rear seat, peel the carpet away from the right side rear seat cushion area of body.
Figure 4

Once you have removed the rear seat, peel the carpet away from the right side rear seat cushion area of body. (green arrow)

Hold the carpet out of the way, and then remove four 10mm nuts from access panel.
Figure 5

Hold the carpet out of the way, and then remove four 10mm nuts from access panel. (green arrows)

Remove access panel lid from body by lifting up.
Figure 6

Remove access panel lid from body by lifting up. Move away enough to access electrical connector on fuel pump module.

Now that you have access to the fuel pump terminals, you will connect your DVOM to the terminals by backprobing.
Figure 7

Now that you have access to the fuel pump terminals, you will connect your DVOM to the terminals by backprobing. Connect DVOM across fuel pump terminals. Green arrow points to where positive lead goes, Yellow arrow points to where black lead goes.

Press Start Stop key like you wanted to start the engine, allow engine to crank if it doesn't start, DVOM should read around 10 volts.
Figure 8

Press Start Stop key like you wanted to start the engine, allow engine to crank if it doesn't start, DVOM should read around 10 volts. If no voltage is found, check ground to fuel pump and fuel pump fuse F70 in the junction box. Double check the fuse number with your model specific information. When Start button is pressed, fuel pump will receive voltage for 3-5 seconds, if engine doesn't start.

I suggest load testing using a test light and a DVOM.
Figure 9

I suggest load testing using a test light and a DVOM. Connect DVOM across fuel pump electrical connector terminals and take a reading, it should read battery volts when key is turned ON. Then connect an incandescent bulb style test light to battery ground and touch the test light probe tip the positive wire you are backprobing with DVOM. Your reading should hold steady, a maximum drop in voltage of 0.5 volts is OK. Anything more is a problem. In this photo, voltage head steady at current fuel pump demand.

To confirm a pump can supply fuel pressure to the fuel rail, you can manually activate the fuel pump.
Figure 10

To confirm a pump can supply fuel pressure to the fuel rail, you can manually activate the fuel pump. Use a fused jumper lead set to battery positive (+) and battery negative (-) and run pump. Green arrow points to where positive (+) lead goes, Yellow arrow points to where negative (-) lead goes.

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Comments and Suggestions:
Ricardo Comments: I have a E90, the fuse #70 blow every time I put a new one, inspected the fuel pump module and was burned, do I have to change the pump before putting a new module?
December 5, 2016
Todd Comments: I have a 2009 BMW 328i 52 engine, car stalled and got CC-ID 309 code. Replaced fuel pump and ran fine for 60 days, same issue now again. Both times it's been towed home it then starts just fine once off the tow truck. Should I start with a possible EKP fault?
November 28, 2016
  Followup from the Pelican Staff: That fault code doesn't show up in my chart. I would need the P-code of BMW code.

Could be an issue with the fuel pump or module. I would perform a fuel delivery system test. Check fuel pressure, volume and quality.
- Nick at Pelican Parts
 
Andrey Comments: Hello,

I have a 325i E90 2006. I replaced the fuel pumpright side and sending unit/pressure regulatorleft side. They were both leaking fuel. After replacement, I got a service engine soon light, P1447. I replaced the DMTL pump. I can't get rid of the service engine soon light. I reset it but a few day later it comes back. Car running fine.
November 21, 2016
  Followup from the Pelican Staff: The tank may be leaking at one of the service collars for the units. Check tightness there. - Nick at Pelican Parts  
giannis Comments: "If you cycle the key and bring fuel pressure up to 4.5 bar without trying to start it, does it start as soon as pressure is up? if so, I would replace the fuel pump"
Many times cycle the key but never start up immediately,before start never increase the fuel pressure
at 4,5bar
November 17, 2016
  Followup from the Pelican Staff: Then check if the pump is being cycled on when you cycle key, if so the pump is faulty. - Nick at Pelican Parts  
giannis Comments: Hi i have 120i e87 2005
when it is cold it is cracks for 5sec before starts
i measure the fuel pressure and i notice that it is too low before start cold1 bar and after 4,5bar,
after 1 hour pressure will be 3.5bar
what is the faulty fuel pump or fuel pressure regulator
those are difrents parts in my car. fuel regulator and fuel filter is one item
notice. never replaced the fuel filter and my car works with lpg.thank you
November 11, 2016
  Followup from the Pelican Staff: Could be the fuel pump check valve.

If you cycle the key and bring fuel pressure up to 4.5 bar without trying to start it, does it start as soon as pressure is up? if so, I would replace the fuel pump.

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
 
Chainsaw Comments: Hi, I have a 09 BMW 328i with a 6293 fault code EKPS control current too high. The car sometime run with very rough idle, misfire and stall, when this happened I had to wait for about a haft an hour for it to run normal again. Can you let me know if it has a bad fuel pump or a fuel pump control module or it's something else?

Thank you!!!
October 24, 2016
  Followup from the Pelican Staff: You will have to test the fuel pump and see. Measure fuel pump current. Should draw 8-12 amps. - Nick at Pelican Parts  
Mphilisi Comments: thank you guys for your responses and comment. Can anyone help year BMW 320i e90 2009 does not supply current to the fuel pump and there is no spark. it cranks but does not start. Please help
October 22, 2016
  Followup from the Pelican Staff: Is power or ground missing? I don't have wiring for your vehicle. You will have to activate the fuel pump and check if the fuel pump module is responding. - Nick at Pelican Parts  
Anton Comments: Prologue:
Couple months ago my car didn't start in the morning - cranked for a 30 seconds with no luck. I replaced fuel pump control module the thing from picture with used one from another 328i and car was running again.
Problem:
Car started having rough idle after being parked overnight for the first 30 seconds or so. Also SES light would come on with 29E1 "Fuel mixture control 2" and sometimes with 29E0 same error for other bank error codes.
I checked for vacuum leaks, cleaned MAF. Today I checked fuel pressure as directed in this useful article. It was 3.5 bar before start and on idle and 4.2 bar @ 3000 RPM. I didn't have DVOM, but my code scanner reads data stream from fuel pump control module:
Voltage, terminal 30: 14.5 V
Voltage, terminal 15: 14.3 V
Voltage, fuel pump: 5.1 V
Current, fuel pump: 5.9 A
Question: Do I have a problem with fuel pump or is it pump's control module? Or is it something else?
Thanks a bunch in advance!
PS: My car is '08 BMW 328i Coupe, with N51, last 7 VIN: P118734, 85K miles.
October 22, 2016
  Followup from the Pelican Staff: Current looks low. I would confirm the fuel pump is supplied good power and ground, if so it is likely faulty. - Nick at Pelican Parts  
Anton Comments: What is the thread size on fuel pressure test port?
October 17, 2016
  Followup from the Pelican Staff: I don't have that info. - Nick at Pelican Parts  
hotdog Comments: ma bmw e90 petrol a put gallon petrol in car it used all it within 5 min car stinking petrol missing got told high pressure fuel pump
October 9, 2016
  Followup from the Pelican Staff: If it smells like fuel, check the fuel tank or lines for leaks. Do not drive the vehicle until you find the source. The top of the fuel tank is a common spot for leaks. - Nick at Pelican Parts  
Turicate Comments: I have a 330i 2006 e90; my car cranks ok but won't start I checked the pressure on the rail and goes up to 50 psi there is no power to the spark plugs; what can it be? Thanks for your help
October 2, 2016
  Followup from the Pelican Staff: Check the main relay and fuse for the ignition coils.


I would grab a repair manual. It will have the wiring and fuse locations.

Give our parts specialists a call at 1-888-280-7799.- Nick at Pelican Parts
 
burns bm Comments: no engine light and no codes
September 23, 2016
  Followup from the Pelican Staff: You should check spark, fuel and compression on all cylinders. - Nick at Pelican Parts  
burns bm Comments: Hi there was hoping you could shine some light on a problem im having with my e90 06 325i n52 the car has a slight stutter at idle but biggest problem is when driving the car has a big flat spot at 3-4 rpm i have had the car running on live data and it seems to be pulling ignition timing leaving car down on power i also had the car on a rolling road showing the flat spot im noticing and a few other smaller less noticeable ones.The car is showing no fault codes at all i have installed new plugs and cleaned and swapped exhaust and intake solenoids but no difference could this be hpfp or injector.Many thanks
September 13, 2016
  Followup from the Pelican Staff: Is the check engine light on or flashing when the problem is present? Sounds like an engine misfire. I would check spark, fuel and compression on all cylinders.
- Nick at Pelican Parts
 
HusMakki Comments: Hi Guys. I'm having trouble with the fuel pump since I bought the car 2 weeks ago. So i had the fuel pump malfunction warning come up and the car stalled. I lifted the seat and gave the fuel pump housing a little shake and was able to start the car again. it happened twice after and doing the same thing didnt help. The weird thing is that when I disconnect the battery and connect it again the car starts fine. the error codes I'm getting on carly adapter are:
EKP-Engin failure 6293
EKP-motor: voltage 6292
August 1, 2016
  Followup from the Pelican Staff: You didn't mention what vehicle you have. That fault can be for a faulty duel pump or the EKP module. Depends on where the signal fails. I would check voltage output to the pump from the EKP. - Nick at Pelican Parts  
Joe T Comments: Note that this is a follow-up to my July 15, 2016 post where my 2011 E90 would not start. I followed the diagnostic here which indicated that I had a faulty fuel pump. I ordered a replacement and installed it. During the installation, I noticed that a hose was loose inside the tank that connected the fuel pump housing to the pressure sensor. This loose hose allowed the fuel to dump back into the tank and not pressurize the rail. This was the actual cause of the no-start condition. Since I already installed the replacement pump, I left it in place and buttoned up the tank. The car started right away but had a rough idle. Fuel rail pressure was only 65 psi. The rough idle eventually went away as the ECM trimmed the injectors. However, the "Service Engine Soon" lamp lit. All service is current and none are due. My scan tool is showing codes P0170 and P0174 active for "Fuel Trim Malfunction". I suspect that this may be caused by the low fuel rail pressure. I read elsewhere that BMW changed fuel pumps to increase rail pressure. I suspect that the replacement pump may be of the old vintage. Do any forum readers have any experience with this topic?
July 29, 2016
  Followup from the Pelican Staff: I do not know of an updated pump. The parts specialists will be able to see any superseded part numbers. Give our parts specialists a call at 1-888-280-7799 - Nick at Pelican Parts  
Kingtik Comments: The fuses and relay good ! But no voltage in the output EKP !
July 25, 2016
  Followup from the Pelican Staff: EKP may be faulty. Only way to know for sure is to command the pump on using a BMW scan tool and monitor the circuit. - Nick at Pelican Parts  
kingtik Comments: Hello, i have a 330d e90 231ps my car won't starts, fuel pump iss good when i put 12v it's working fine, but when i press the start button and put my dvom i have only 1.57v on the connector i don't listening the fuel pump and my car doesn't starts. thx
July 21, 2016
  Followup from the Pelican Staff: I would grab the wiring diagram. You may have a voltage drop for the control circuit. - Nick at Pelican Parts  
DjK Comments: I have a n43 engine 2008 3 series,it crank but doesn't start, I already change the 2 camshaft and crankshaft I also replaced the 2 vanos solenoid,battery is fine took it Oort then tested the voltage and the reading is 12,I need help please any suggestions. Thank you.
July 20, 2016
  Followup from the Pelican Staff: 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
 
Joe T Comments: I have a 2011 E90 that will not start. Ran fuel pressure check as described here and verified had no pressure at the fuel rail when cranking and also had adequate voltage to the fuel pump. Now need to order replacement fuel pump.
July 15, 2016
  Followup from the Pelican Staff: Awesome, glad the article helped. 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
 
MPHILISI Comments: HI THERE, MY CAR e90 2009 320i DOES NOT WANNA START, WHEN TURNED ON IT SHOWS FUEL SUPPLY FAULTY. WHAT COULD BE THE REAL PROBLEM. I WAS ON THE ROAD WHEN IT CUT OFF. PLEASE HELP.
July 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
 
Dave M Comments: Hey thanks for responding. I don't have a pic as the car is now at the mechanic. Was not fuel pump. Anyway, it's a round 6 pin connector you rotate the outer part and it comes straight up and off. it's kind of an external locking ring. It was just stuck, I eventually got it off.
June 20, 2016
  Followup from the Pelican Staff: - Nick at Pelican Parts  
dave m Comments: I have a 2009 LCI 328i with the single round electrical plug versus the two you squeeze. How do you get that off?

thanks
June 18, 2016
  Followup from the Pelican Staff: I would need to see a photo of the connector to comment. Can you share one? - Nick at Pelican Parts  
Sajmik Comments: Hello, check engine light is not on, I dont think it is misfire.
Otherwise car pulls strongly and smoothly in higher RPM. I cleaned VANOS solenoids, but I wouldn't be surprised if it was something mechanical in VANOS if it is possible?

Also MAF came to my mind. Few months back I tried new MAF and there was no difference, but I didnt let the car adapt maybe? Just started saw the uneven idle and took the new MAF out.

https://www.youtube.com/watch?v=9pL8cfP53U4 here is a video I took a while back. It is similar now, but maybe the needle is moving little bit more.

Thanks again !
May 9, 2016
  Followup from the Pelican Staff: MAf will not cause misfire like symptoms you are describing. Check the items I noted. if VANOS was the issue, it would show up in dynamic compression. - Nick at Pelican Parts  
Sajmik Comments: Hello,

I've got 2005 E90 330i n52b30 engine.
On cold start car starts nicely, but almost immediately there is uneven idle. Like 50 rpm up and down, but needle is visibly moving. On warm start the whole car shakes for few secs 2-3secs and again uneven idle. Also under about 1600 rpm car accelerates weirdly and it is hard to perform smooth 1-2 low rpm shift. shifting to second at like 2700 makes the shift much more easier to make smooth than shifting under approximately 2500 and hitting the rpm on second gear under mentioned 1600. And at last but not least, fuel consumption indicator started fluctuating at even speed. - this wasnt happening until last few weeks. Could this be a fuel pump? I am having these problems for last year, wouldnt the fuel pump failed completely until now? Also it didnt got much worse. If not fuel pump, could it be lower grade fuel i am using? 95 here in europe instead of 98. If yes, is there method to reset car computer to adapt for better fuel without diagnostic tool? Sorry for my english and would really appreciate your answer.

Kind regards, Simon
May 8, 2016
  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. You may find an issue with the VANOS system.
- Nick at Pelican Parts
 
Mio Comments: Hi sir, I have a 2006 e90 320i. I was just wondering maybe you have an idea to the problem of my car. Everytime I start the engine it has rough idle its like it is misfiring. But when I turn on the aircon, rough lessen and sometimes it becomes smooth. The power is still there but the annoying rough idle always there when I turned off the engine. Also 1 sprk plugs misfire. I changed spark plugs and coil already but it still there. Thank you I hope you can help me.
April 8, 2016
  Followup from the Pelican Staff: When the a/c is turned on, the idle raises. This may smooth out the engine is your issue is related to a vacuum leak. I would check the engine for vacuum leaks or unmetered air leaks. - Nick at Pelican Parts  
Andy Comments: Hi Nick, how can i diagnose if this issue is "fuel pump check valve" Or "Pressure regulator" or other cause on this model. Thanks
April 7, 2016
  Followup from the Pelican Staff: It doesn't matter. As both are part of the fuel pump module, replaced as a unit. 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
 
Andy Comments: Hi Guys, my 2008 328xi hard starting issue seems to be related to not maintaining fuel pressure after car is stopped/turned off. While engine is on, pressure is around 68 psi, when turned off it drops immediately to zero no pressure .

Anyone knows where is the "fuel pump check valve"? Is it built into the pump unit in the tank? can I replace it alone, or must replace the entire fuel pump?

Thanks
Andy
April 5, 2016
  Followup from the Pelican Staff: It is part of the pump. 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  
Andy Comments: Hi, where is the fuel pump check valve. My 2008 BMW 328xi is NOT holing pressure after engine stop. Its causing hard start 3-6 seconds of cranking before it starts.
April 3, 2016
  Followup from the Pelican Staff: It is part of the pump. 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
 
FM Comments: Hi Guys, I have a 2007 328i and my problem is that when I always go to the gas station and I put gas is the car, it does not start until I wait for couple of minutes and then starts with assist, more so it stalls as I drive too.
I had the mechanic test the fuel pump and it reads 72 psi with pressure test for more than 20 minutes, and it sounds like the pump is running perfect.
What could be the issue there??
March 20, 2016
  Followup from the Pelican Staff: 72 PSI is too high. There may be an issue with the sending unit or regulator on the sending unit, inside the tank. - Nick at Pelican Parts  
Grib Comments: Its OK - I found it.
March 8, 2016
  Followup from the Pelican Staff: What did you find? - Nick at Pelican Parts  
David Comments: To check for short, can I just detach harness from the EKP end? Where does the other end of harness go to, ECU box? Thanks.
November 11, 2015
  Followup from the Pelican Staff: No, both ends have to be detached, otherwise you can ruin other components while testing. - Nick at Pelican Parts  
David Comments: Thanks Nick. Would I be able to replace EKP and then drive car to shop for the coding, or is EKP unusable before coding and will have to tow car to shop?
November 11, 2015
  Followup from the Pelican Staff: Good question. You may be able to. I am not 100% sure. if the car doesn't drive now, worth a try. Worse case is you have to tow. - Nick at Pelican Parts  
David Comments: I disconnected the fuel pump control module and the fuse no longer blows. Does this highly implies that I have a bad EKP or is there a good chance still that my problem is with the wiring? I read that coding is needed for new EKP. Would I be able to replace EKP and then drive car to shop for the coding, or is EKP unusable before coding and will have to tow car to shop? Thanks Nick!
November 11, 2015
  Followup from the Pelican Staff: I would assume the EKP is faulty. Check if the harness is shorted by detaching it at both ends, then use a test light to battery positive and check if it lights when inserted into the circuit. Be sure the harness is disconnected for all components of the fuel pump control. - Nick at Pelican Parts  
David Comments: Some additional data regarding previous question e90 06 325i. Having trouble starting the car due to blown fuel pump fuse #35. With ignition off and no key, the new 20amp fuse would blow as soon as i put it in. I've disconnected the electrical connectors for the following items and the fuse still blows: fuel pump, lower hose temp sensor, large plug on top of radiator, coolant temp sensor, oil temp sensor. Appreciate your help with this.
November 10, 2015
  Followup from the Pelican Staff: The problem is likely in the fuel pump control module or wiring, if fuse blows with fuel pump disconnected. - Nick at Pelican Parts  
David Comments: Hi Nick, I have an e90 06 325i. Having trouble starting the car. I've traced it down to fuel pump not running due to blown fuse #35. I disconnected the fuel pump's electrical connectors, and yet as soon as I plug in a new 20amp fuse, it blows immediately. I'm guessing that helps rule out out a bad fuel pump? What should i be testing next? Thanks!
November 9, 2015
  Followup from the Pelican Staff: Best way to test is to check the current draw of the pump. The short could be the pump or the electronic fuel pump module. - Nick at Pelican Parts  
Tony Comments: On a 08 335, what pressure should I see at the rail?
October 10, 2015
  Followup from the Pelican Staff: You can't test turbocharged engines at the rail. Pressure is too high. The test is performed using a BMW scan tool. - Nick at Pelican Parts  
Scott Comments: just kind of racking my brain part of me wants to think its fuel related just being that during the colder months higher density fuel don't notice the issue, but it comes back when it gets warmer weather out. plugs and coils I replaced last fall when it first started, and it seems to have the issue in midrange RPM ~2500 to around 4kRPM feels like a miss but more a hesitation. you don't see much injector "noise" during higher rpm unloaded, but loaded is where the fuel pressure tends to wander a few psig the ST< trims are acceptable so it dosent lead me to a lean or injector issue. cleaned and checked VANOS solenoids but I need a BMW scan tool to put it into its self test mode and actually give some data feedback. I guess the quest continues. thanks
April 30, 2015
  Followup from the Pelican Staff: Assumptions won't get results. You have to check each part of the combustion process to locate a misfire. - Nick at Pelican Parts  
scott Comments: thanks Nick!, that is troubling to "throw a pump" at it and not know if it truly will fix the issue. it would be easier if it just failed,
April 29, 2015
  Followup from the Pelican Staff: You don't have to throw a pump at it. You can find out what is causing the misfire. I would check spark, fuel and compression on all cylinders. - Nick at Pelican Parts  
scott Comments: the fuel pressure spec is 72.5psi +/- what? it should have a tolerance. im measuring 70-74psi approx. under load, lower pressure I get a misfire like condition any thoughts
April 28, 2015
  Followup from the Pelican Staff: Fuel pressure is electronically controlled using pump speed. It is a set pressure of 5 bar. BMW states, fuel pressure will not fluctuate as you mentioned. This has been my experience as well.- Nick at Pelican Parts  
zee Comments: Hi, I have a 2006 BMW 325i e90 .Having a fuel pump voltage issue.Ignition on, I have 75 psi fuel pressure, but once starts it goes back to 25 psi. Voltage on my pump is 4v.Is this normal,it often stalls.Replaced pump and module,no change.
April 24, 2015
  Followup from the Pelican Staff: Power and ground both come from the fuel pump module. I would try monitoring voltage while commanding the fuel pump on at 100%, see what voltage is. - Nick at Pelican Parts  
DWS335 Comments: 2007 335i. I'm getting a reading now from the same pictures mentioned above. And the elwctric pump is running. Car starts up rough then shuts off. HPFP?
March 24, 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
 
DWS335 Comments: Hi, I just want to start out by saying thanks for all of the information provided. I disconnected both fuel pump connections to test for voltage. Only one of the two gave me a reading. I hear the pump turning on, but should I get a reading from both electrical connections. Thanks
March 22, 2015
  Followup from the Pelican Staff: What vehicle are you working on? Which side of the vehicle had what readings? Wire colors, terminal numbers, etc? - Nick at Pelican Parts  
Knatte Comments: 2006 :
February 25, 2015
  Followup from the Pelican Staff: We didn't have a diesel in the US that year. So I don't have the wiring. See if you can locate a wiring diagram and share it here. Then i can help.- Nick at Pelican Parts  
Knatte Comments: Hi Nick : , i've got a E91 330D just measured the voltage at the pump and it's confusing, i got something like 3v when inserted keycard then while cranking 8 - 9v, is this normal? what could i do?
February 25, 2015
  Followup from the Pelican Staff: What year is the vehicle? - Nick at Pelican Parts  
bmwtrevor Comments: hi can anyone help me? I have a 2005 bmw 320i, I am having trouble locating the ekpm fuel pump module. can anyone tell me where to find it. many thanks in advance.
February 17, 2015
  Followup from the Pelican Staff: We don't have that vehicle here. But on US models, it is behind the right rear seat back cushion. On the C-pillar. - Nick at Pelican Parts  
exhausted Comments: having problems with my 328i, first replaced starter and after driving it a bit it started shaking bad returned to shop they said they forgot to reconnect a wire now I had to replace fuel pump but now it doesnt register that its full? was there a step missed?
January 6, 2015
  Followup from the Pelican Staff: If the fuel level doesn't register, there maybe an issue with the level sender in the tank. It may have been left unplugged during the repair. - Nick at Pelican Parts  
dad Comments: hi nick thanks for all your info i got a2.8hilux a little heavy on desol got any advice
August 27, 2013
  Followup from the Pelican Staff: A drop in mileage can be many things, from a leaking injector to a different diesel blend. Might want to start by checking the DME for pending fault codes. - Nick at Pelican Parts  
DAD Comments: hi guys this weekend my brakes just come n go then i have to pump it up a little to work and then i top up brake flute and it just sucs away wat can it be n we do i look thanx pals.
August 12, 2013
  Followup from the Pelican Staff: Sounds like you have a brake fluid leak. I would inspect the hydraulic system for leaks. Look for dripping fluid under your vehicle. - Nick at Pelican Parts  
DAD Comments: hi nick my bmw box type got another motor and a top know carr is runing good but i hear a noise from the power steering pully and i notice the pully doesnt swing evenly sligthly wobbling do i need to worry or can u help me thanx
July 22, 2013
  Followup from the Pelican Staff: if the pulley is wobbling, it could be bent or the power steering pump itlself could be bent. I would remove the drive belt and inspect both. - Nick at Pelican Parts  
dad Comments: hi nick if i put on a uther cylinder head on will that solve my compresstion probblem n thanx for the advice man really appriciate it
July 8, 2013
  Followup from the Pelican Staff: You never loved me. A new head will probably take care of it - Nick at Pelican Parts  
DAD Comments: HI GUYS MY BMW 320I BOX TYPE AUTO DONT HAVE COMPRESSTION TO START THE CARR THE SPARK PLUG HID A VAVLE WHO IN RETURN HID A PISTON I REPLACE THEM ALL WITH PISTON RINGS AND BAERINGS WEN WE WANT TO START THE CARR IT WONT START NO COMPRESSTION CAN U HELP ME THANX.
July 5, 2013
  Followup from the Pelican Staff: You will have to perform a cylinder leak down test to determine where the loss of compression is. - Nick at Pelican Parts  

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