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What cause the fuel pump not to run on a 1996 Chevrolet pick-up truck Silverado 5.7L?

Posted by Joe Russell on

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4 Answers

jack layton

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  • Chevrolet Master
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Jump the switch side of relay with jumper wire, cavities for terminals 30 and 87 in diagram. As you see in diagram, terminal 87 shows to be fuse protected and hot all the time. switch side is left side of relay in diagram. The pump should run with jumper, don't need the key. You can also see fuel pump/oil pressure switch, redundant power supply to the fuel pump. Even w/o the relay, once you crank it enough to bring up oil pressure, that switch closes and the pump should run, depending.
what cause the fuel pump not to run on a 1996 Chev - fuel pump relay-undefined-undefined-0.jpg

Posted on May 04, 2021

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Carl Rock

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  • Chevrolet Master
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The fuel pump power feed is fused and switched by the fuel pump relay.

The relay is controlled by the PCM.

The PCM energizes the relay depending on the position of the ignition key and the input from the crankshaft position sensor.

The pump will not run if the pump is bad, the relay does not energize, or an open circuit exists from battery positive to pump fuse from fuse to relay or from relay to pump or pump ground (battery negative).

Posted on May 03, 2021

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ray gallant

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  • Chevrolet Master
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Possibly a bad relay

Posted on Apr 28, 2021

  • 6 more comments 
  • Joe Russell Apr 28, 2021

    i can hear the relay working when i turn the key on but the pump not coming on.

  • ray gallant Apr 28, 2021

    the replace the pump

  • Joe Russell May 03, 2021

    can i just replace the fuel pump or do i need to replace the fuel pump & housing assembly?

  • ray gallant May 03, 2021

    you can but it requires dropping the tank. testing the relay is 1st option and lots cheaper thanthe pmump

  • Joe Russell May 04, 2021

    how do i test the relay?

  • ray gallant May 04, 2021

    i buy a new one and try it and hope I didn't waste my money

  • Joe Russell May 04, 2021

    i jump terminals 30 and 87 the pump don't run

  • Joe Russell May 04, 2021

    when i turn the key on i can hear the relay click

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john h

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  • Chevrolet Master
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If it's the original pump you have been lucky was no recall but if and when the unit failed you had to replace the harness connector a well due to corrosion which caused the pump to fail this may not be the problem with yours like RAY states check relay first check for power to the pump and the pump is Incorporated in to the housing unit

Posted on May 03, 2021

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