Question about 2000 GMC Sonoma Extended Cab

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2000 GMC Sonoma will not start after standing serveral hours

I have a 2000 GMC Sonoma. Sometimes, it will not start after standing serveral hours even though the fuel pump sounds like it operates. If I pour some gas down the throttle body, it will start and remain running and I can drive it but sometimes if feels like it lacks power. Sometimes when it will not start, if I cycle the fuel pump several times before trying to start, it will nearly start and then a few more cycles of the pump will start it. It seems that the fuel pressure is lost. Is this a fuel pump problem even though I can drive it after it starts? or might it be another problem? I have changed the fuel pressure regulator and the fuel filter.

Thinking it could possibly be the fuel pump, I have removed the box which I felt was easier than removing the tank. I can't tell how to remove the pump. I did this same thing with a Chev. S-10 and it had a flange that could be turned. I don't see how to turn a flange in the Sonoma.
Thanks

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  • ranlaum Nov 16, 2009

    Thanks for the warning on pouring gas down the throttle body!

    Speaking of that, it seems that when the gas tank is empty is when it would not start on its own with out putting some gas down the throttle body. Otherwise, with a full tank and now it is at 1/2 full, I was able to cycle the pump several times and it would start on its own.

    The mechanic that changed by fuel pressure requlator said that the pressure seemed to be good (but I thought he said 50 PSI) but it didn't stay pressurized. When the pump was off, it would lose pressure.

  • ranlaum Nov 19, 2009

    I thought that you might like to know that the pump was ok after all. There is a black tube that runs from the pump to the bottom of the inside of the housing for the fuel pump. It appears this is where the gas is drawn from the tank to the pump through a little screen filter. This tube became disconnected from the housing. After replacing it and reinstalling everything back in the tank, the truck now starts perfect. I'm not sure why it became disconnected but for now, not having to replace the pump saved me quite abit of money.

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Check the fuel pressure at the shredder valve, you should have 62 to 65 PSI when the fuel system is primed. (engine not running) With the engine started and running the pressure should drop by 5 PSI, anything less then 62 PSI in your fuel system when trying to start the engine will cause a no start. Note; that try to start a the engine by pouring gas through the throttle body may cause an internal fire in the intake ports and will cause the fuel injectors to melt creating a more expensive problem. As for the fuel pump in the gas tank, it''s held on by and snap ring which you can remove with a simple screw driver. Good luck and keep me posted, and don't for get to replace the wire harness from the frame to the gas tank. It's a $12.00 investment that's worth more then it's cost.

Posted on Nov 16, 2009

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