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post #1 of (permalink) Old 09-21-2002, 04:39 PM
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vortec 4.3 hard starting

My sons 92 jimmy 4.3 vortec takes a lot of cranking to start, after sitting a while. My question is concerning replacing the fuel lines going into CPI. where they exit plenum, do they just pull off the hose barbs? or do i have to undo the fuel lines and do more dis-assembly?. Are there any o-rings associated with the metal adapter that goes to plastic lines to CPI that could need replacing?
Does any body know GM part # ? or non-dealer place to buy them.

Here are more details, CPI was 6 months old, has been starting great, then all of a sudden, hard starting, like before. So we got autozone to replace CPI under warrenty, but that didn't fix it. We turned key on with plenum off, didn't see any fuel leaking from lines or CPI, but there was fuel puddled in intake. We checked that we have 55lbs fuel preasure when key is turned on, coolant and air temp sensors read okay. Timming is just were we set it 6 months ago, so no jumped timing chain.
Runs great after starting. What else could it be?
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post #2 of (permalink) Old 09-23-2002, 03:18 PM
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Re: vortec 4.3 hard starting

FUEL PUMP!!!

Check how much pressure your getting up to the CPI again. It should be near 60 psi (57-64). My 93 was doing the same exact thing. I checked it when it started acting up and the pressure was fine. So i started changing parts left and right and nothing was working. Starting just kept gettin worse and worse. After changing everything i could think of, including the $300 CPI unit, I checked my pressure once again and it was down to 40 lbs. So the problem turned out to be my fuel pump. Truck starts right up everytime now and drives just like it did before. Hope that helps you out some.
post #3 of (permalink) Old 09-28-2002, 06:01 PM
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Re: vortec 4.3 hard starting

New CPI fuel lines fixed it, thanks for your help,
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