No Power to Fuel Pump or relay. - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 12-29-2009, 09:58 AM
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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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#2 (permalink) Old 12-29-2009, 11:22 AM
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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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#3 (permalink) Old 12-29-2009, 11:57 AM
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If it cranks and the pump doesnt cut in its possibly crankshaft sensor...

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#4 (permalink) Old 12-30-2009, 04:13 AM
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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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#5 (permalink) Old 01-01-2010, 08:37 PM
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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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#6 (permalink) Old 01-01-2010, 11:13 PM
OMFG another one!?
 
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witeshark is just really nice witeshark is just really nice witeshark is just really nice witeshark is just really nice witeshark is just really nice
Very glad you got it sorted!

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