Question about 1988 GMC S-15

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88 gmc s15 wont stay running after it is warm

I was told the fuel pump was bad. i changed it. when it warms up to temp, and you shut it off, then it will not start back up. like it is starved for fuel

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Did you check the fuel pressure before you replaced the pump ?
Can you spray carb cleaner or starting fluid into the throttle body and make the engine want to start ?
If it is throttle body injected, can you see the fuel spray when you crank it hot ?

Posted on Jan 23, 2013

  • 3 more comments 
  • Justin Clunas Jan 23, 2013

    i did not check the fuel pressure. could it be the fuel pressure regulator that is on top of the throttle body? this issue is only when the engine comes up to temp

  •  Stephen
    Stephen Jan 23, 2013

    I doubt it, the regulator would not change with temp.

  • Justin Clunas Jan 23, 2013

    so then i'm back to the fuel pump? the 2 that i have put in have been used from a wrecking yard. it strikes me odd that BOTH would be no good. i can take my original assembly and just by the actual pump itself. which is the cylinder shaped part that attaches to the rest of the copper tubing. and hope for the best? haha

  •  Stephen
    Stephen Jan 23, 2013

    Well there are other possible causes which is why I asked if you checked fuel pressure. The pump relay could be bad or a number of other electrical issues. A weak coil could cause the same effect as low fuel pressure.

  • Justin Clunas Jan 24, 2013

    thank you for your input. i did have it diagnosed at a shop a few months ago. he said it was the fuel pump. that's why i tried to go with a used pump. cuz the whole assembly was too expensive.


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Posted on Jan 02, 2017

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SOURCE: fuel pump

Fuel Pump on this Vehicle is on the inside of the gas tank it is a not so hard job to do if you have done quite a bit of mechanical work, but if not you best get someone who does have the experience since we are talking with dealing directly with the tank that even when empty it can explode with a spark from a tool striking ant metal.

But if You are that person that knows how to tinker with automobiles I Strongly suggest to go to your local auto parts store and get the book in order to follow the instructions safely, trust me I have done 2 chevy astros and a thunderbird. Good Luck.

Posted on Sep 18, 2008

  • 314 Answers

SOURCE: 88 GMC S15 starting plus other problems

REplace the fuel filter, then check for vaccum leakes around the intake. My guess is the carb it close to falling off! LOL Frankster016

Posted on Dec 07, 2008

SOURCE: my 2003 gmc yukon wont start

fuel pump is bad change unit

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SOURCE: Cant get truck to stay running

did you try the fuel filter

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SOURCE: 1998 gmc 2500 sle 5.7 wont stay running

this is in fact the right answer check the oil guage in the truck it should read about 375.

Posted on Dec 15, 2009

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