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General E46 Forum
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Old 01-13-2013, 08:33 PM   #1
itismyname
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Question Location of Fuel Pump Check Valve

Car is 2002 BMW 330Ci. Searched Bentley manual and Google to no avail.
Is there a check valve or non-return valve in the fuel delivering system somewhere?
Is it in/on the fuel pump or somewhere along the fuel delivery system?
If it could be replaced independently could you provide a part number?

Last edited by itismyname; 01-13-2013 at 08:37 PM.
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Old 01-13-2013, 10:38 PM   #2
flashmeow
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Quote:
Originally Posted by itismyname View Post
Car is 2002 BMW 330Ci. Searched Bentley manual and Google to no avail.
Is there a check valve or non-return valve in the fuel delivering system somewhere?
Is it in/on the fuel pump or somewhere along the fuel delivery system?
If it could be replaced independently could you provide a part number?

I don't know much about the MS43 and newer but for mS42, there is a 3/2 valve that helps regulate the flow of fuel to and from the fuel pressure regulator.

I know that your car has a built in fuel pressure regulator at the fuel filter. there is a single fuel line that runs to your fuel rails. MS42 has two fuel lines. Also, your car burns off residual fuel after you turn off your engine.

i know this didn't really answer your questions but i hope it helps anyway
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Old 01-13-2013, 10:40 PM   #3
itismyname
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No problem, thanks for your input!
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Old 01-13-2013, 10:40 PM   #4
jfoj
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Most all of the fuel pump check valves are built into the fuel pump and are non serviceable.

Not sure what problem or issue you are trying to resolve?

Suggest you read the 2nd link below in my signature regarding fuel pump issues.
__________________
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 01-13-2013, 11:27 PM   #5
itismyname
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Join Date: Nov 2012
Location: socal
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Fuel pump works fine with 50 psi. But as soon as it stops pumping, fuel pressure drops to zero. I'm planning to replace the fuel filter first to see if that helps.
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Old 01-14-2013, 05:37 AM   #6
jfoj
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Fuel filter will doubtful resolve your problem, but it should be replaced anyway. It is possible the fuel pressure regulator inside the filter is not holding pressure?

If you pressure drops to 0, then you either have a bad fuel pump, a bad pressure regulator valve (inside fuel filter), a fuel leak between the pump and the engine, or a leaking injector(s).

Good luck with sorting it out, but be prepared to replace the fuel pump if the filter does not help your situation.
__________________
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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