Question about 1990 Ford F250

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1990 f250 5.0 dual tank , truck starts running bad , backfire & quits running alltogether after the gas tank gets below half way mark also seems to be more of a problem on an up hill grade . Have flushed out the tank , changed fuel filter . and the front tank pump doesnt work at all

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Backfiring is not going to have anything to do with the level of fuel in the tank. You most likely have burned valves or broken valve springs in your engine. I would do a compression test.

Posted on Mar 26, 2011

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