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Old 04-13-2014, 08:20 AM   #1
NurLinks
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Join Date: Apr 2014
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Fuel pump going bad again?

Hey Guys,

Brand new here and right away asking questions . But I can't seem to find the answer anywhere and this forum seems to be the best informed. Have been lurking for a while and making good use of the DIY's. Thank you for that.

Anyway:

Have had my 325 for a good 2 years now and had fuel pump troubles from the start. At first it was replaced with a second hand pump (just the pump, no the whole unit) and after that one broke just a few months later (both went while on vacation ) it was replaced with a brand new one almost 2 years ago.

In the times before the replacement I had the long crank before starting and bad starting in general, which I've found described a couple of times here. After the fuel pump was installed these problems went away. After I did a big overhaul on the car and replaced all the filters, fluids etc. Car ran even better then, seemed the fuel filter was very dirty as well. This was about a year ago, but since yesterday the exact same problems returned. Long cranking on warm engine...

I'm fearing this will lead to long cranking and bad starting again and my gut feeling is telling me fuel pump/filter again.

I've only driven about 15k miles since the pump was replaced and even less since the filter and overhaul, so how can it be possible it's going again? Dirt in the tank? Is there anyway to check that? Or any other issues which may lead to this?

Any help would be grealtly appreciated!
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Old 04-13-2014, 08:51 AM   #2
jfoj
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See 2nd link below in my signature for fuel pump info. Static fuel pressure test should answer your questions.

You may also have a camshaft position going soft if you hare having long crank times but no static fuel pressure problems.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 04-13-2014, 09:14 AM   #3
NurLinks
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Thanks! But what if the pump is going bad again... what could cause it?
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Old 04-13-2014, 09:57 AM   #4
jfoj
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Quote:
Originally Posted by NurLinks View Post
Thanks! But what if the pump is going bad again... what could cause it?
The pump, fuel pressure regulator and injectors are the basic end points to keep the fuel rail under pressure when the engine is turned off. There may be other things in the fuel supply link depending on the year of the car.

Bottom line is the fuel pressure should be maintained for 20+ minutes once the engine is turned off. In reality, I have seen cars sit for months or years and still have fuel pressure in the fuel lines.
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 04-13-2014, 10:05 AM   #5
Stinger9
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What brand fuel pump is in your car now?
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Old 04-13-2014, 10:29 AM   #6
NurLinks
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Don't know the exact brand, but it is OEM, so probably bosch or vdo?
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Old 04-13-2014, 10:34 AM   #7
jfoj
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Unscrew the fuel pressure test point and depress the valve with a towel covering the opening. If you get a solid spray of fuel, the fuel pump is not likely the problem.
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 04-13-2014, 10:51 AM   #8
Stinger9
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Quote:
Originally Posted by NurLinks View Post
Don't know the exact brand, but it is OEM, so probably bosch or vdo?
Unsure answers always give us pause for doubt.
And brand makes a huge difference.
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Old 04-13-2014, 10:55 AM   #9
NurLinks
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It is an OEM pump.
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Old 04-13-2014, 05:05 PM   #10
Tmerrill49
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I'm having the same issue on my 2000 328i. Cold start is usually fine but once it warms up it'll have a long start, sometimes it'll even start up but kind of stutter out and shut off.
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Old 04-13-2014, 05:12 PM   #11
jfoj
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Static fuel pressure is the easiest thing to check, otherwise I would be guessing at a sloppy camshaft position sensor.
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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