1994 GMC JIMMY 94 JIMMY FUEL PUMP / NO START

  • Tiny
  • christoph80254
  • 1994 GMC Jimmy

Engine Performance problem
1994 GMC Jimmy 6 cyl Two Wheel Drive Automatic 126000 miles

I have a GMC jimmy 1994 with 126000 miles. It left me stranded the other day. I replaced the fuel pump and filter and sending unit today. It still will not start. If I put gas in the intake it runs fine till it burns it off. I checked the bleed off valve right behing the manifold and its getting gas all the way to the intakes. Im at a loss on what to do to get my truck running any advice would be greatful! Thanks for your time.
chris in louisiana

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Saturday, March 29th, 2008 AT 9:25 PM

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  • Tiny
  • merlin2021
  • Expert
  • 17,589 posts

I think Raz is refering to the oil pressure/fuel relay cutoff switch on the top rear of the engine, also does the pump run for 2-3 seconds after the key is turned to on? Have you checked for power at the pump?

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Sunday, March 30th, 2008 AT 5:55 AM
  • Tiny
  • christoph80254
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Yes when I turn the key the pump kicks on for 2 seconds. I can hear it. So I should check the oil pressure fuel relay cutoff? Is that the same thing as the fuel pump relay?

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Sunday, March 30th, 2008 AT 8:06 AM
  • Tiny
  • merlin2021
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No. The oil pressure switch is on the top rear of the engine, If this is the CFI unit check for brittle wires at the injector.

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Sunday, March 30th, 2008 AT 8:14 AM
  • Tiny
  • merlin2021
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  • 17,589 posts

Check the CFI unit's wires.

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Monday, March 31st, 2008 AT 12:54 PM

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