Question about 1998 GMC Sierra

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98 GMC 4X4 won't start

1998 GMC 4X4 won't start. If I put fuel in the throttle body it will start and run great. After the first start of the day it will start every time for the most part. However, after it sits over night I have to put fuel in the thottle body to get it started. It seems to be getting worse. I have recently replaced the fuel pump, Fuel filter, sparkplugs, new battery, and I have ran injector cleaner through it. What next?

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  • Kevin Siers Jun 02, 2009

    Thank you! Dan the fix, Is there only one injector? Also, any advice on the how to? I am very mechanically inclined so I should be able to do this on my own?

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Replace throttle body injector

Posted on Jun 02, 2009

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You are losing fuel pressure in your fuel line after sitting for long periods of time. Usually the culprit is the fuel pressure regulator. The injectors could be leaking after shut-off as well.

one way to check if you are losing fuel pressure. After sitting for a long period of time, try turning the key on for 5 seconds then turn off, repeat 3 times and see if you are able to start without spraying fuel. If this works, look for a loss of fuel pressure in your fuel lines.

Posted on Nov 29, 2010

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But more likely fuel preshure is douwn! check your fuel pump for preshure, once started the engine can live with that for a time I think you will find it is that!
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