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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 12-29-2009, 09:58 AM   #1 (permalink)
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Unhappy No Power to Fuel Pump or relay.

OK so my rebuild of my m52(its in a 92 325i) is finally done and last night I tried starting it for the first time. I turned it over first just to build oil pressure and then I connected all the ignition coils and the fuel pump.

When I turned the key the fuel pump did not energize like it shouldve. I then checked to see if I had voltage at the pump.

I got a reading of 12 volts at the white connector w/ two yellow wires and a reading of 0 volts at the black connector with green wire w/ violet chaser and a red wire. According to the bentley manual I should be seeing voltage there too.

Checked the fuse and its good

Checked relay and its good but its not getting power.

I cycled the key like 20-30 times but still no luck.

So any suggestions to why the relay is not getting power? I have no problem diag'ing it, I was just thinking maybe there was something im unaware of that would be causing this.

Any Help is much appreciated

Dave
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Old 12-29-2009, 11:22 AM   #2 (permalink)
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OK I worked on it today for a little and came up with


Fuel pump works because I used a jumper wire from pin 30 to 87 on the fuel pump relay and it kicked on ( showed 80psi on my fuel pressure gauge which is way to high)

I have 12 volts between 86 and 85 which is correct since thats the side that causes the relay to close.

But when I turn the key to run with the relay in I have nothing.

Well off to the dealership to see if i can get some answers
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Old 12-29-2009, 11:57 AM   #3 (permalink)
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If it cranks and the pump doesnt cut in its possibly crankshaft sensor...
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Old 12-30-2009, 04:13 AM   #4 (permalink)
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Swap the fuel pump relay. You have already confirmed that it is the problem (i.e. there is power to the control side and output side).
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Old 01-01-2010, 08:37 PM   #5 (permalink)
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Well fixed the issue, since the battery died I had to reprogram the obc. Did that and car fired right up. Nothing beats hearing your car for the first time ever.
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Old 01-01-2010, 11:13 PM   #6 (permalink)
OMFG another one!?
 
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Very glad you got it sorted!
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