95 525 i/t (e34) no start please help - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 04-03-2011, 09:54 PM
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95 525 i/t (e34) no start please help

i have a 95 525 i/t (e34) that i replaced the fuel pump on and the car still wont start. i tried the stomp test to check for codes and there are none. im also getting spark to all cylinders. i checked my fuel pressure regulator and it seems fine. the diaphragm doesnt seem to be ruptured. i also pulled the fuel rail and fuel injectors off and turned it over with them out and i dont seem to be getting sufficient spray from any of them. i get a feeling that im getting a block at the fuel pressure regulator. the new fuel pump is working great and im getting plenty of pressure compared to the old one. i tried running it on ether and it will attempt to start but i cant get it to keep running. i cracked the fuel lines with the old one and i had no pressure or fuel at all. this car is driving me nuts, ive never had a car stump me like this. please help
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#2 (permalink) Old 04-05-2011, 01:20 AM
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Check for fuel pressure at the fuel rail near the fuel pressure regulator as soon as you can while turning it over.
Check also for proper voltage at the fuel pump connector. There should be 12 volts for a couple of seconds with you turn the key on (without starting the engine) while the pump primes the system.
When cranking the pump should get power continually, and boost fuel pressure up to 35 to 45 psi approximately. And with key off, pressure should not get too low (or lower than 8-10 psi) otherwise the pressure regulator is defective. Check for pressure at or near the fuel pressure regulator. See if when removing the fuel tank cap the tank sucks air. Also check the ignition fuses. Hope this helps at least a little bit, and good luck.
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