Question about 1999 Pontiac Sunfire

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No power to fuel pump 1999 sunfire

No power to fuel pump fuse es good relay good swtill no power

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Check the wiring at the fuel pump assembly for corrosion, if the wires look ok, i would then move to the Crank and cam shaft sensors. if these sensors are not in good condition , it will cuase these actions.

if everythign checks out ok with the sensors, this will confirm a serious PCM issue.

Posted on Jun 19, 2009

  • Michael Masters
    Michael Masters Jun 19, 2009

    I would also run a diagnostic scan on the vehicle for any stored trouble codes that may be in the PCM/ECM.

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I have a 1997 sunfire 2.4. engine changed fuel pump relay an fuse am not getting any voltage to the fuse box or relay fuel pump will not kick on any suggestions?


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I have a 06 f150 5.4L the fuel sending unit went out so i had to change to pump and everything, the pickup ran fine before but wen i put the new pump in it will not work so i tried resetting the fuel pump...


Hello, There is a fuel pump Relay in the Powerbox under the hood. The system works this way. When you turn on the Ignition switch, it trips the Fuel pump Relay. The power is routed to the fuse from the Relay and then to the Inertia (safety) cutoff switch. Finally the power reaches the Fuel pump.

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On most Models, the horn Relay is the same part as the Relay on the Fuel pump. Just check your part numbers and swap out the two parts and see if it helps.

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