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Thread: Pump works, but getting no power.

  1. #1
    Senior Member Delorean3610's Avatar
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    Pump works, but getting no power.

    So the car ran great two weeks ago, but now won't start. After some checking, 12v straight to the fuel pump runs it but no power is getting to it.

    I've checked that the relay is receiving 12v. 12v to ground on the relay socket is good, and bypassing it yields no results.


    Fuses 1 and 7 are receiving 12v.

    What else should I be doing.

  2. #2
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

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    Sounds like your inertia switch may have opened.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  3. #3
    Senior Member Delorean3610's Avatar
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    Quote Originally Posted by Bitsyncmaster View Post
    Sounds like your inertia switch may have opened.
    It wasn't popped up when I checked, is there something I'm missing.

  4. #4
    Senior Member Bitsyncmaster's Avatar
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    You need to put a meter on the connections on the fuel pump. Then you can determine if it's the ground side or power side at fault.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  5. #5
    Senior Member Delorean3610's Avatar
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    Quote Originally Posted by Bitsyncmaster View Post
    You need to put a meter on the connections on the fuel pump. Then you can determine if it's the ground side or power side at fault.

    I have continuity between relay socket and the positive lead of the fuel pump, and continuity between the inertia switch socket and negative socket of the fuel pump.

  6. #6
    Senior Member Delorean3610's Avatar
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    When I jump the relay I only get about five volts at the fuel pump to ground.

  7. #7
    Senior Member Bitsyncmaster's Avatar
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    Quote Originally Posted by Delorean3610 View Post
    When I jump the relay I only get about five volts at the fuel pump to ground.
    If your meter ground was on the battery neg post then you have proven the power side of the pump is bad since your dropping about 7 volts somewhere. First think to check is the pump two pin connector.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  8. #8
    Senior Member Delorean3610's Avatar
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    Quote Originally Posted by Bitsyncmaster View Post
    If your meter ground was on the battery neg post then you have proven the power side of the pump is bad since your dropping about 7 volts somewhere. First think to check is the pump two pin connector.

    Yes, it is two pin

  9. #9
    Senior Member Delorean3610's Avatar
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    Update!

    When jumping the relay and jumping the inertia switch while still using the fuel pumps natural wires, the pump runs.


    Jumping inertia switch with relay plugged in, pump does not run.

    Possible bad relay and switch?

  10. #10
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

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    Pump will run down to about 7 volts. You will want to measure the voltage across the pump to make sure your getting good voltage. It would be unlikely your RPM relay and inertia switch went bad at the same time.
    Dave M vin 03572
    http://dm-eng.weebly.com/

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