Question about 1991 Ford F150
Have the same truck and had the exact same problem. Mine spilled out the front tank. Ford did a recall on this problem. They put valves on the lines outside the tanks. Mine had already been done so that was not the problem. The pumps have valves inside for the return lines. I replaced the rear pump, didn't fix it. Replaced the front pump and Voila ... it was fixed. Bad valve in the front pump return line.
Posted on Nov 15, 2010
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Posted on Jan 02, 2017
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