won't start

1990 GMC SIERRA
V8 • 4WD • AUTOMATIC
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BRICKLAYER_JEFF
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  • 2 POSTS
My 1990 GMC Sierra won't start unless I pour gass in the throttle body. Once it starts it runs fine. I replaced the fuel pump, fuel filter and fuel pump relay. What else could be the problem?
Its a 350 cid with fuel injection.
Dec 10, 2010 at 9:41 PM
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RASMATAZ
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Do you hear the fuel pump come On when you turn key on? If not check fuel pump fuse and fuel pump relay if so, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light.
Dec 11, 2010 at 7:45 AM
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BRICKLAYER_JEFF
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yes I can hear the fuel pump when I turn the key on.
Dec 12, 2010 at 8:12 PM
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