1990 Chevy Truck starting

1990 CHEVROLET TRUCK
777,777 MILES • 6 CYL • 2WD • AUTOMATIC
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TJPENNY
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  • 3 POSTS
This is odd and I have asked everyone sometimes my truck starts and sometimes it does not. Have had multiple people look at it the fuel pump has been replaced the ignition module has been replace but sometime it just will not start and others it runs great it will crank sometimes the fuel pump cuts on and sometimes it does not. please can you give me any ideas
Oct 11, 2010 at 1:55 PM
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WRENCHTECH
  • ✓ASE Certified Mechanic
  • 20,761 POSTS
  • ASE Certified Mechanic
Have you positively determined the fuel pump is quitting? How did you do that?
Is this a Vortec or a TBI?
Oct 11, 2010 at 2:41 PM
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TJPENNY
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  • 3 POSTS
i have no idea the fuel pump sometimes works and sometimes doesnt and you can hear it when its on and when its not
Oct 11, 2010 at 3:12 PM
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TJPENNY
  • MEMBER
  • 3 POSTS
it also doesnt quit once it is running it does not shut off unless you turn it off
Oct 11, 2010 at 3:13 PM
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WRENCHTECH
  • ✓ASE Certified Mechanic
  • 20,761 POSTS
  • ASE Certified Mechanic
You need to use a fuel pressure gauge and get some positive answers of what the pump is doing.
You could have a bad fuel pump relay. When the relay is bad you won't get the 2 second prime but it will eventually get power through the oil pressure switch but not until after oil pressure builds up.
Oct 11, 2010 at 3:21 PM
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