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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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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, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose temp switch O-ring - BMW #13621743299
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Old 01-13-2013, 11:27 PM   #5
itismyname
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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, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose temp switch O-ring - BMW #13621743299
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Old 06-12-2016, 07:06 PM   #7
WifE46
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New fuel filter - all vacuum lines replaced - now get lean codes - new maf sensor - now get more lean codes - found disa valve defective - replaced - now hard start... WHAT? Why? no codes yet but what do you guys think? go back to old MAF cuz it never threw a code - just changed so everything in system would be new. (new cheap MAF might be problem?) would hate to think fuel pump is going now that almost everything that could cause problems is done...
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Old 06-12-2016, 09:05 PM   #8
jfoj
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Put the orginal MAF back on the car.

If the fuel pump is original, it probably needs to be replaced.

Post Freeze Frame and warm idle Fuel Trim data.
__________________
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, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose temp switch O-ring - BMW #13621743299
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Old 06-13-2016, 07:43 AM   #9
WifE46
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not sure if it was ever replaced - I finally got all monitors to clear - now I may have to do fuel pump for peace of mind - I'll watch it - but if it walks like a soft fail fuel pump - it's coming out...
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Old 06-13-2016, 03:37 PM   #10
WifE46
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I unplugged maf sensor - car started fine - ran ok - got the little gear symbol like drivetrain problem - shut down - plugged maf back in - starts like a champ each time. little gear symbol gone. fuel pressure test - pressure does not hold - power key on - get 18-20 psi - start car - get 46.5 psi - shut off car and pressure drops slowly down to 0psi - the fuel filter is new - if the fuel filter is good - would it hold pressure and keep you from knowing if the check valve in the fuel pump is going? getting conflicting info on this - doesn't make sense for a fuel pressure regulator to hold pressure. how would fuel return to fuel tank if there were a check valve in the fuel filter. Is that design only on the fuel filter with no fuel pressure regulator and only one nipple on each end? Teach me. BTW - I had to remove Schrader valve to do test with the rental fuel pressure tester since no fitting would work properly. would this change my pressure readings?
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Old 06-13-2016, 03:52 PM   #11
WifE46
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yeah - answered my own question - fuel pump in near future - adding another check valve might solve the hard start but the pump will fail eventually...
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Old 06-13-2016, 04:07 PM   #12
jfoj
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Quote:
Originally Posted by WifE46 View Post
yeah - answered my own question - fuel pump in near future - adding another check valve might solve the hard start but the pump will fail eventually...
Read this, http://forum.e46fanatics.com/showthread.php?t=929501

There is not an E46 on the road that should have the original fuel pump still installed. Even if the pump is not the primary problem, you increase the reliability of the car.
__________________
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, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose temp switch O-ring - BMW #13621743299

Last edited by jfoj; 06-13-2016 at 04:08 PM.
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Old 06-13-2016, 05:40 PM   #13
WifE46
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yeah - that's what I read before posting here... more of a fyi or rant - finally passed inspection then have to do a fuel pump - only started for inspection techs on 2nd try - BUT NO CODES! YAY!
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Old 08-13-2016, 03:59 AM   #14
WifE46
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still have the turn key to prime fuel pump 1st then start problem - already replaced fuel pump and filter and have no codes - got codes for misfire on 3 cylinder once - reset and it hasn't come back. Full tune up was already done. All I can see left are fuel injectors. Coil packs or some crank sensor, throttle position sensor or something. Not gonna throw parts at it - need to narrow it down... the check valve idea keeps coming up in my mind. Or maybe a mini fuel pump to boost fuel on demand so car can start the 1st try
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Old 08-13-2016, 10:07 AM   #15
Manolito
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Fuel pump should hold line pressure when shut off. I didn't bleed it down when I replaced the fuel pump on my wagon because it had been sitting overnight, and it still sprayed fuel when I pulled the hose. Turned out that the fuel pump was not my problem, but after 125k miles, it was probably prudent to replace it. My 330i fuel pump failed and left my wife stranded at 75k miles. My boss's wife's 325i fuel pump stranded her before it hit 50k miles.
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Old 08-13-2016, 12:33 PM   #16
WifE46
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charging the battery today - Multi meter didn't read well right away due to slight powdering on terminals (BINGO?!) Checked teminals where no corrosion existed and got 12.5v - so pulled the battery - cleaned terminals and leads/xconnectors - put on charge at 10amps - its been hours an hasn't reached 100% - seriously? may have bad or weak battery - it's an exide with the sight glass and the sight glass aint green - it is also not serviceable so I can't check acid level - so hopefully that is the culprit and it takes the charge...
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