Question about 1998 GMC Jimmy

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Fuel System on 1998 GMC Jimmy 4.6L engine

I have been told I need a fuel filter, which I replaced. And it still does the same thing. Then I was told , a fuel pump by one mechanic, a #1 injector by another, simple tune up by the third one. After replacing fuel filter, It still looses power , after about 15-20 miles it actually shuts down, and now it will not stay cranked. Can you tell me where the fuel pump is or give me a link to the scematics for this model?

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  • wedsbydeb Sep 11, 2008

    Well Kinda, I would like to know if the #1 Injector could be causing this problem? That is what the computer says is wrong, but 3 different mechanics have told me three different solutions, I just replace the entire coolant system and that is when the trouble began. I replaced the lower intake manifold radiator , water pump and thermostate..could this be related or do you think it is time to replace the fuel system as well? Best guess is fine...

    thanks Debby

  • wedsbydeb Sep 13, 2008

    I have been looking for one...But your right .I need one badly.. Thanks for the helpful tip and good information.

  • wedsbydeb Sep 16, 2008

    I got it was the fuel pump module in the tank. $384.96 out the door...thanks for all your help.


  • wedsbydeb Sep 17, 2008

    Thanks for all the help..

  • Anonymous Mar 17, 2009

    my 1998 jimmy gmc looses power sometimes up hill only and the service engnie soon light comes on which set a code P0300 random misfire or some times misfire at clinnder#1 detected i loooe power until i reach the top of the hill then the service engine light flashes and then stays on. thanks for any help out there charles

  • yadayada
    yadayada May 11, 2010

    The fuel pump is in the fuel tank, it is called the fuel pump module, is this your question??



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That's right! Fuel pump is in the fuel tank, some car has opening to acces in the trunk under the carpet, some car you need to take down the tank, my advise is get your self a service manual for your truck its about $25.00 and it will help a lot.
Good luck.

Posted on Sep 13, 2008

  • Marvin Santos Sep 17, 2008

    Good to hear that!

    Now you are ready for winter.


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  • GMC Master
  • 78,010 Answers

Great glad to help.

Posted on Sep 16, 2008


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