Question about GMC K1500

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Have a 98 gmc 5.7 truck have to prime to start truck.

Have a 98 GMC K1500 4x4 truck 5.7 vortec 350 I have to prime the carb you might say with a small amount of gas to start the truck. it runs ok after it runs a while and will atart back up if you don,t let it set to long more than an hour or so and i have to prime it again. changed filter,fuel pump if working fine is the regulator going bad?

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Sounds to me like either your pressure regulator is bad or you have a loose fitting somewhere in the fuel line from the fuel pump to the engine. When you turn your key to the on position, you should hear the whine of the fuel pump until it builds pressure. When you shut the truck off the pressure regulator should retain the pressure for a certain amount of time but if it don't close then air is allowed into the fuel line and the fuel drains down to fuel line away from the engine. Next time you try and start the truck after it has sat for a while try turning the key on until you hear the fuel pump whine shut off, then repeat it 3-5 times and then try to start it. Basically that is running the pump enough to get the fuel back up to the injectors. Check for loose fittings in the fuel line, or cracks in the fuel line and if all that is fine then replace the regulator.

Hope that helps

Posted on Oct 03, 2009

Testimonial: "sounds like a good idea i will try that THANKS!!!"

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Check pressure relief valve on fuel system

Posted on Oct 03, 2009

Testimonial: "OK THANKS I will try that!!"

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Ok I am wondering if my motor in my 91 gmc 5.7 l b8 is a vortec or a 350 it has throttle body carb and not sure thought if I could interchange it with an older 350 ..


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