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Won't start

Tiny
BRICKLAYER_JEFF
  • MEMBER
  • 1990 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
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.
Friday, December 10th, 2010 AT 9:41 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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.
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Saturday, December 11th, 2010 AT 7:45 AM
Tiny
BRICKLAYER_JEFF
  • MEMBER
  • 2 POSTS
Yes I can hear the fuel pump when I turn the key on.
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Sunday, December 12th, 2010 AT 8:12 PM

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