Question about 1992 Oldsmobile Cutlass

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No power to the fuel pump

New pump, switched the relay, it will rum with a hot wire from the pos of the batt to the pump any ideas?

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  • puman1970 Dec 11, 2008

    this was a help but all that is working good I'm thinking ecm what is you thought on that?

  • Anonymous Mar 26, 2014

    86 6.2 diesel 4x4 alt freaked out gauge went pos to neg rapidly. Then no power batts and wires were hot to touch. No power when ign switch turned on.



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Sounds like you either have a bad relay or wiring issue here. First I would check to make sure your fuel pump fuse isnt blown 2.) Get a multimeter and check to see if you get power from the relay. 3 check to make sure you are getting a good ground the fuel pump. 4 check to make sure you are getting power to the relay. 5) Check to make sure you have a good relay. Hope this gives you some direction. Thanks for Using FixYa!



Posted on Nov 28, 2008


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Your looking for power on the yellow wire when the ignition switch is in the run or start position. This feeds power to the ignition module and power that energies the fuel pump relay as well.

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Engine Starts:

· Fuel Pump secondary circuit shorted to power

· Fuel pump relay contacts always closed

· Open in fuel pump monitor (FPM) circuit between ECU and connection to POWER TO PUMP circuit

· Heated Exhaust Gas Oxygen (HEGO) sensor shorted to power

· faulty ECU

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· Open inertia switch or inertia switch circuit

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· faulty ground connection at fuel pump

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If all the above is working as designed, them you probably have a bad fuel pump.

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At the fuel pump relay you should have 1 full time hot wire. 1 hot wire when you turn on the switch. 1 ground, and the other wire goes to the pump. Test the ground to be sure it is good. If so then jump a hot to the one that goes to the pump and see if it runs.If it does then you have a bad relay or ECM. You can swap the relay with another of the same # from tour fuse box to test it.There is also a ground on top of the frame near the filler neck, check it too. Good Luck

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