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General E46 Forum
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Old 12-19-2016, 05:41 PM   #1
rtn28
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Join Date: Oct 2016
Location: cbus
Posts: 21
My Ride: 00'328CI
Fuel pressure issue

2000 328Ci

Fuel pressure is at 20 psi with key on, jumps to 47psi when running, then back to 18 0r 20 psi when i turn off the engine. Vaccum line is good to fpr!!

My first guess would be check valve in fuel pump, but then the 3/2 valve thingy where the fpr is mounted draws my att.

Does the flow direction valve act as a check valve for holding pressure??

Does the fpr act as a check valve for Holding pressure??

Does the fuel pump have a check valve??

Is there a Check valve inline somewere??

Any accurate answers would be much appreciated!!

Last edited by rtn28; 12-19-2016 at 05:44 PM.
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Old 12-19-2016, 05:50 PM   #2
jfoj
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 22,984
My Ride: 330CiC, M5, X5, E93
Replace the fuel pump, it needs replacement regardless if this is the issue or not.

I do not bother to even check fuel pressure on cars over 8 years old, I just replace the fuel pump - Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501
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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, 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 12-19-2016, 07:46 PM   #3
rtn28
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Join Date: Oct 2016
Location: cbus
Posts: 21
My Ride: 00'328CI
I agree about replacing it, but... if the fuel pump is not the issue, that would suck, because i cant afford to just throw parts at it.
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Old 12-19-2016, 07:57 PM   #4
jfoj
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Location: Fairfax, VA USA
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My Ride: 330CiC, M5, X5, E93
Fuel pump should have a check valve.

Fuel pressure regulator should also hold fuel pressure as well on the other end of the fuel line.

Fuel Pressure Regulators rarely fail and when they do it is usually the diaphragm and they leak through the hose connection.

EVERY E46 needs a new fuel pump by now.
__________________
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 01-03-2017, 01:26 PM   #5
rtn28
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Join Date: Oct 2016
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Posts: 21
My Ride: 00'328CI
New fuel pump, same problem. Waiting on regulator
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3/2 valve, fuel pressure, fuel pressure regulator, fuel pump

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