Question about 1998 GMC Sierra

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Truck died (just like it was the fuel pump). Pump is good, Have gas all the way to the intake. It is firing. Something is not releasing the gas at the intake. My guess is a sensor or the control module. Need to know what sensors could cause immediate gas cut-off @ intake. TPS maybe? thanks

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  • ctheldreth Dec 13, 2009

    Checked the crank sensor (per Haynes book). It checked good. With fingres crossed, changed the fuel filter. Didn't effect things.
    The only thing that checks bad is the EGR valve. But can't see that causing it to not run at all.
    Planning on checking the fuel pressure tomorrow, and if it isn't up to required pressure, change the pump. Unless you guyshave any other suggestions. Also I really thank you for taking your time to help me.

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All of the above are swell answers but ive had this problem in my 96 sierra 2500, have the presure checked at the intake, i had a fuel pump go, then had it replaced.(by gm) and then used the truck for a couple weeks, then sat the truck for 30 days, went to start the truck.... no start. had pressure checked at dealership. boom bad pump, not enough pressure. the unit was replaced again and im a year into this one never failed again.

Posted on Dec 12, 2009

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If crank or camshaft sensor fails there will be no starts,shutoff while driving,hardtime starting but these should set a problem code. have vehicle scanned to see if you have any problem codes. if no scanner any auto parts store will scan for free. a bad tps sensor will cause shift issues, bucking, jerking, surging, and engine cut off and hesitation on take off. if tps is bad pcm will get false information. if car shuts off after running for a while, could be a bad crank sensor.

Posted on Dec 12, 2009

  • carl Dec 12, 2009

    if crank or camshaft sensor fails there will be no starts,shutoff while driving,hardtime starting but these should set a problem code. have vehicle scanned to see if you have any problem codes. if no scanner any auto parts store will scan for free. a bad tps sensor will cause shift issues, bucking, jerking, surging, and engine cut off and hesitation on take off. if tps is bad pcm will get false information. if car shuts off after running for a while, could be a bad crank sensor.

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