Mechanics

94 FUEL PUMP / NO START

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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Christoph80254
March 29, 2008.



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?

Merlin2021
Mar 30, 2008.
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?

Tiny
Christoph80254
Mar 30, 2008.
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.

Merlin2021
Mar 30, 2008.
Check the CFI unit's wires.

Merlin2021
Mar 31, 2008.