Question about 1989 GMC K1500

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OK I have a 97 savana 1500 van runs great until it gets hot and then when you shut it off and try to restart will not start acts ike no gas. pump runs, I thought maybe vapor lock but no go there either. It hasn't stalled going down the road yet. any thoughts?

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  • jimnnancyh Jun 27, 2009

    Thanks for the tip but no go still the same. I am doing a fuel pressure check and getting a reading of about 59 to 60 while idle and when i shut it off it holds at that pressure. I did notice though when I try to start pressure drops to under 40 and will not start. I tried turning the key on and off a few times to build pressure and when it got above 50 it started. I believe its the fuel pump but just wanted a second opinion before I spend a couple of hundred on it.

  • jimnnancyh Jun 28, 2009

    where is the fuel pressure regulator? Is it under the upper manifold ( I hope not) I was told to try and replace this before the pump make sense?

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  • GMC Master
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If you have good fuel pressure, then i'ld lean towards the Ignition Control Module (ICM) it's around $40.00 at Auto Zone. They work when there still cold and when they heat up, they start to fail till they cool down again and eventually they fail totally. Auto Zone will have the step by step instruction to getting the job done. The ICM is under the rotor in the distributor, and the wires may also be corroded or broken. Inspect for any damages to the wire harness in the distributor before installing the new ICM. Good luck and hope this helps.

Posted on Jun 25, 2009

  • Harvey N Tawatao
    Harvey N Tawatao Jun 28, 2009

    The fuel pressure in the SEFI in your Van should be 60 to 65psi when at prime (when the key's are on the run position with the engine off) with the engine running the it should drop by 5psi. Any other reading will give you a hard or not start at all. I do know the life to the fuel pump is around 150,000 miles, you may get more if you run the fuel tank over half tank. The gas keep's the fuel pump cool and a clean fuel filter will not heat up the fuel pump as much. You can try changing the fuel filter first and see what the readings are and if there is no change, then time for a new fuel pump. Just be thankful you do not have the newer vans. The fuel filter is apart of the fuel pump now. Keep me posted. be glad to help and keep up the great work.

  • Harvey N Tawatao
    Harvey N Tawatao Jun 29, 2009

    The fuel pressure regulator is a part of the SEFI but you need the fuel pressure reading before it enters the fuel pressure regulator and that is through the shredder valve. The shredder valve should be along the fuel line just before it go's in to the SEFI where the fuel pressure regulator is at. As mentioned there should be 60 to 65psi when the ignition key's are in the run position and engine not running, and when the engine is running there should be a 5 psi drop. Keep me posted, be glad to help. I am leaning towards a bad fuel pump sense they have a life expectancy of 150,000 miles. Good luck friend. 

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