Question about 1998 GMC Sierra

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If my pickup starts then shuts off does that mean the fuel pump is bad

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This would be 1 possibility, can you hear the fuel pump whine or making a noise when you first turn on the key?
It should whine for a couple of seconds to pressurize the fule system then shut off until you try to start the engine. The best way to check is to connect a fuel pressure gauge to the fuel rail connector (looks like a tire valve stem) and the gauge screws onto this fitting. When you turn the key on you should see the pressure gauge read the pressure going to the fuel rail, when you start the engine you should see the pressure maintain pressure to keep the engine running. If not then the could mean that the fuel pressure is weak and would need replacing. Hope this helps

Posted on Dec 11, 2009


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