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Posted on Dec 13, 2009
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1998 gmc 2500 wont keep running

Replaced the fuel pump and fuel relay on a 1998 gmc 2500 5.7 vortec turn ignition switch fuel pump comes on primes engine starts for 2 seconds and dies. any ideas whats next? Everything worked great till fuel pump went out.

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  • jasonlhardes Dec 13, 2009

    great, im happy to start anywhere, anyidea what i do to get the antitheft to let my truck run lol. thankyou for ur help

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2 Answers

honeymokey

honeymokey

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  • Master 3,113 Answers
  • Posted on Dec 13, 2009
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The anti thieft system is keeping it from running.

  • honeymokey
    honeymokey Dec 14, 2009

    AUTO LEARN
    Time required, approximately 10 minutes:


        Insure that the battery is fully charged.
          Use the scan tool in order to clear the DTCs.
            Turn the ignition switch from the OFF position to the CRANK position attempting to start the vehicle. The vehicle will start and then stall.
              Leave the ignition switch in the ON position while observing the security indicator.
                When the security indicator turns off, which can take up to 10 minutes, turn the ignition switch off. Wait 10 seconds.


            Read more: http://www.justanswer.com/questions/1bwx...

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  • Master 1,627 Answers
  • Posted on Dec 13, 2009
Anonymous
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The 2 second prime is normal,it won't run again until it sees engine speed so you may need a crankshaft speed senser.

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My 94 gmc g2500 vandura put new fuel pump in but it wont work when cranking check fuse replaced pump relay nd oil senor I have hot wired the pump nd it works its just not working with key
Have you checked for power to the pump from the fuel pump relay.After the key has been off for 10 seconds,turn it on and there should be a short 2 or 3 second pulse of power from the relay and you should also hear a click there.If there is no power pulse,is there power to the relay?Remember the relay only primes the fuel system and the oil pressure switch keeps power to the pump when it sees oil pressure.Is there power at all times to the oil pressure switch?On these vans the wire from front to the pump can go bad,quite a few have had a new wire run for the pump over the years.A great van.
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Wont start unless manually primed
Turn the ignition key to the ON position without starting the engine

You should hear the fuel pump priming for about a few seconds then shutting itself off.
If not hear replace the engine oil pressure switch
The 3rd wire to that switch is the pumps prime switch lead.
When the engines oil pressure is reached the computer will shut that circuit off and turn on the fuel pump relay
If you hear the pump prime the relay maybe at fault instead
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you'll need a professional computer to reset how ever there are two relays for fuel on chevrolet
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My 94 gmc g2500 vandura put new fuel pump in but it wont work when cranking check fuse replaced pump relay nd oil senor I have hot wired the pump nd it works its just not working with key

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