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5.4 Lacks power

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Torqued_Up

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In the last year I have seen quite a few 5.4L trucks with low power and codes P0171 and P0174. All of them except one had bad fuel pumps. I know that there was a TSB or SSM back a couple of years about the pick up screen being too fine and clogging. A lot of these trucks also had water problems with custom bodies that had the wrong sized fuel filler vent hoses. Water and dirt would whip up from the rear tire and enter the tank at the loose hose near the filler cap.

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