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E34 (1989 - 1995)

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  #1  
Old 06-09-2014, 10:23 PM
TheStriker095 TheStriker095 is offline
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Mein Auto: 1992 BMW E34 535i Sedan
Fuel Pressure Regulator

Hi all,

I am wondering if anyone knows how to test a fuel pressure regulator. I have pulled the vacuum hose off of the regulator and the smell of fuel is present (the hose has to be right up near your nose), is this normal? I have also left the car running for 5 minutes without the hose connected, no fuel spat out.
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  #2  
Old 06-10-2014, 07:16 AM
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E34ZombieHunter E34ZombieHunter is online now
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It should not smell like fuel, that means the diaphragm is leaking.
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  #3  
Old 06-10-2014, 10:58 AM
TheStriker095 TheStriker095 is offline
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That what I thought, just needed confirmation I shall order a new one ASAP.
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  #4  
Old 06-10-2014, 10:23 PM
Larrick Larrick is offline
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why do you suspect a bad Fuel Pressure Regulator?
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  #5  
Old 06-10-2014, 10:32 PM
TheStriker095 TheStriker095 is offline
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Engine's idle is not satisfactory... Also occasional long cranking times (5 seconds max). I actually opted to pressure test the FPR, and no pressure was lost through the diaphragm after 10 minutes. Fuel pump pressure is within specification. All other sensors and electronics (AFM, ICV, CTS) are tested good, compression is good. No vacuum leaks, all ignition parts have been replaced (cap and rotor & coil, wires tested good).

What is normal idle quality of an M30B35? Are my expectations too high? Is a occasional small jolt normal when at idling speeds?

Also is it normal for these engines to take a few extra cranks to start from cold? Once warm it start up within 1 second.
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Last edited by TheStriker095; 06-10-2014 at 10:34 PM.
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  #6  
Old 06-11-2014, 08:42 AM
Larrick Larrick is offline
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I do not know about M30B35 engines.
I do have some knowledge of the M50 with regard to FPR.
I am curious about your testing of the fuel pump and FPR.
The M50 which I tested has a fuel pressure of 34 and should have 51 psi.
BUT..the engine runs perfectly.
I suspect that the engine has a wide range of fuel pressure in which it runs well.

What were your psi numbers?
What is the desired specs number?
Did you perform the "pinch" test by restricting the return line fuel hose (after the FPR) and
see if the pressure spiked?
That is the test for a fuel pump.
FPR only decreases fuel pressure from the pump.
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