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E28 (1982 - 1988)

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  #1  
Old 05-13-2011, 05:38 PM
cmartin7x cmartin7x is offline
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Location: princeton indiana
 
Join Date: May 2011
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Mein Auto: bmw 535i
fuel line question

with the 535i i just bought, its not running right. i pulled the fuel line off of the fuel pressure regulator thats right on top of the front of the engine. when i turned the key forward no fuel came out. when i cranked it over fuel flows out of the fuel pressure regulator instead of the fuel line. did someone cross these lines sometime in the past? or am i missing something
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  #2  
Old 05-14-2011, 08:49 AM
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catso catso is offline
catso
Location: Chicago
 
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Mein Auto: 2000 323i, 1988 528e
Quote:
Originally Posted by cmartin7x View Post
with the 535i i just bought, its not running right. i pulled the fuel line off of the fuel pressure regulator thats right on top of the front of the engine. when i turned the key forward no fuel came out. when i cranked it over fuel flows out of the fuel pressure regulator instead of the fuel line. did someone cross these lines sometime in the past? or am i missing something
Your car has the fuel enter the rail at the rear and return to the tank througt the pressure regulator. You really need to get yourself a Bentley's manual to diagnose your problems.
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Old 06-08-2011, 06:54 AM
nowayray nowayray is offline
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Location: northern il
 
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Mein Auto: 88 535i
i have the same when does the fuel get regulated? or does it just flow back to the tank ? i tried to apply vac to the top port no difference. the car still seems to run out of gas
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  #4  
Old 07-06-2011, 07:02 AM
jimoreno jimoreno is offline
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The regulator controls the pressure of the fuel at the injectors by varying the amount of fuel that it lets return to the tank. If the fuel comes out of the top line (smaller) then your diaphragm is bad and you need a new FPR. By the way, it will only pump fuel when cranking and for 2 seconds if the engine doesn't run (safety).
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Last edited by jimoreno; 07-06-2011 at 09:24 AM.
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