Car grounded , fuel problems, help needed... - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 06-07-2009, 11:53 AM
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Car grounded , fuel problems, help needed...

Car - 1991 735. I was driving down the road when car just stalled on me. I think I killed fuel pump (have been driving on almost empty for a while). Anyways, I diagnosied dead fuel pump (no sound when ignition key is turned, that familiar "Pzzzzzt" for 2-3 seconds).
Changed fuel pump. It worls. i know, because when i removed fuel like from Pressure Regulator, crank the car, i see gas spewing out of FPR.
Car doesnt start till. I have my doubts - when you connect fuel pump, there are two wires, "+" and "-", and to be honest, i am not sure, if I re-connected them properly. Could that be a problem? Any advice is appreciateds, thanks a lot
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#2 (permalink) Old 06-08-2009, 05:53 PM
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Pump good, could be timing? Took valve cover off, nothing unusual


what else to look for?
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#3 (permalink) Old 06-09-2009, 08:47 AM
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Did you disconnect the battery when you replaced the pump?
I know this is going to sound strange but maybe if you disconnect the battery for a few minutes it'll solve the problem. Just a thought!

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#4 (permalink) Old 06-09-2009, 01:46 PM
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Do you have a spark at the plugs ???

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#5 (permalink) Old 06-10-2009, 11:34 PM
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Battery was dissconected, when I was replacing pump. And, when i cranc the engine, fuel is spewing out of fel pressure regulator, so i know pump is not a problem...
As far as spark plugs, they are just replaced, but to be honest, I havent checked the spark.
Before it happened, car wasn`t misfiring, or else, so i didnt give it a second thought.... I was advised that timing belt could`ve jumped teeth, I took off calve cover looking for any signs of valve damage, or pieces of chain - nothing, everything looks like it should.
I will buy compression tool at Kragens, and will get compression measuring tool in all 6 cylinders, then I will get better picture, thanks a lot for ideas!!

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#6 (permalink) Old 06-11-2009, 03:13 AM
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Why I asked about a spark was.... it may be the Crankshaft sensor.

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