1989 f 150- with 5.0 EFI Won't feed continous fuel, down powers, backfires, etc...

Asked by Apr 07, 2015 at 11:15 AM about the 1989 Ford F-150 XLT Extended Cab LB

Question type: Maintenance & Repair

Just started going down the road yesterday. Like it was dying out...pumped the gas to keep it moving. It has duel tanks. I switched tanks thinking it might be a problem with the gas, or that tanks internal pump. No change. I have since installed a new relay, fuel filter, and pressure pump (on the rail) and it did the same think this morning. I am really at a loss-its like it is not getting gas. Firing is good. Pressure in the gas line is good at the relief port on top of the engine. Any ideas?

1 Answer

22,790

A backfire normally indicates preignition on older vehicles relating to timing. It can be raw gas getting to the Cat Converter on newer vehicles and igniting which could be construed as a backfire. After determining which type of ignition system you have I would check along those lines first.

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