Question about 1991 GMC Sierra

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My 1991 gmc sierra 5.7 liter starts up and runs for 20 minutes and then when i shut it off it won't start up again. also if i start it in the morning and let it idle for 5 minutes it stalls out and i cant get it started again. i changed the fuel pump and the fuel filter. i dont know what else can be wrong with it.

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When it won't start does it have spark? Sounds like it might be the ignition module.

Posted on Jul 31, 2010

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SOURCE: 1991 GMC Sierra K1500 stalls randomly and starts when it wants

A bad ignition module can give you fits!!!! Replace it even if it doesnt fix it! You will be glad you did! Most likely that is the problem ,however!

Posted on Mar 21, 2010

  • 447 Answers

SOURCE: 1999 gmc sierra 2500 6 liter ran out of gas now won't start

If you are at or near the 100,000 mile mark then your fuel pump may have failed. If you remove the fuel filler cap and listen carefully at the filler neck while someone turns the ignition key to "run" [don't actually crank the engine] you should be able to hear the fuel pump buzz for about a second and a half as the key is turned On. If you don't hear the pump buzz then odds are your pump is dead. Your pump may have actually failed making it appear as though you ran out of fuel. Not to uncommon. Hope this helps and good luck!

Posted on Nov 03, 2011

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