1991 5.7 k2500

Asked by Jake Aug 15, 2019 at 12:36 AM about the 1991 Chevrolet C/K 2500 Silverado LB 4WD

Question type: Maintenance & Repair


Missing and running rich I replaced plugs and
wires and temp sensor and map sensor. The
injectors seemed to be spraying a nice even
pattern. Pulled plugs there’s no sign there
everything nice brown burn I’m wondering
vacume line ? Or egr valve

1 Answer
10

Guru1QKK1 answered 4 years ago

I had a problem with my 1990 k2500 running rich. It has throttle body injection and they seem to work fine so i traced the fuel lines back and found that the fuel pump filter inside of the tank was very heavily clogged. I don't exactly know why it was running rich from that but the ecu was stating that it was after i plugged it in. I replaced the fuel pump and used some cleaner for the throttle body and it runs so much better now. I wouldn't check it if you have a pretty good hunch it is something else because to get to the pump you have to jack the bed up off the frame.

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