95 GMC 5.7L fuel system problems?

Mar 02, 2004 4 Replies
O

Hi GMC with 5.7 liter is having some problems with lack of power, and starting after setting a while. 110K miles. Symptoms seemed to indicate a faulty fuel pressure regulator - replaced. seemed to help only a little. Then started to loose power/accelleration and service engine soon light came on. Code 44 : Low O2 reading - replaced sensor - no change. Replaced fuel filter - helped power a lot for a week, O2 indicator still triggered after clearing codes. Replaced filter again, no change this time.



What should I look at next. seems to point towards fuel pump to me, removing tank sounds like a pain.



THanks



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You have two choices: run a fuel pressure test which is a bit of pain on TBI motors without a fuel rail and schraeder valve, or just replace the pump which is likely the culprit.

Doc

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I used an old filter to make a pressure testing adaptor.

The OTC, for my OTC set was $80.00 or more, I can make lots of toys with my torch, solder and a 1/4" brass pipe fitting.

Refinish King

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I just rigged up a T fitting with the appropriate sized threads and run it between the fuel line and TBI underhood. I like the fuel filter idea.......might try to make me one this weekend if the weather stays warm.

Doc

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It's a lot easier than bending the pipes:

Then rebending them to realign them to thread up.

Good luck with the weather Doc!

Refinish King

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