1994 GMC Jimmy Ignition / Fuel pump problems

1994 GMC JIMMY
126,000 MILES • 6 CYL • 2WD • AUTOMATIC
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CHRISTOPH80254
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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
Mar 29, 2008 at 7:06 PM
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RASMATAZ
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The computer energizes the fuel pump relay -the relay wii de-energize in 2secs if this doesn't happen the fuel system will not prime up- When the engine fires up the fuel pump and oil pressure sending unit powers the pump from then on. see below


https://images.2carpros.com/forum/automotive_pictures/12900_oil_sending_unit_and_fuel_pump_circuit_39.gif

Mar 29, 2008 at 7:32 PM
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CHRISTOPH80254
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thanks for the quick reply ...But I really dont know what all that means . Can you tell me what to check or what you think i need to replace.
Mar 29, 2008 at 8:12 PM
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RASMATAZ
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Okay I understand get the fuel pressure check and comeback with the readings and also get checked for injection pulses-meaning the injector/s are opening and closing to give fuel
Mar 30, 2008 at 5:06 PM
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