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Message: [QUOTE="Charles, post: 438675, member: 103"] My Cousin had me look at his truck not long ago because it was down on power and he had already had a HPFP replacement by the dealer a few months beforehand. In his case the lift pump was dying and the reduced fuel to the original HPFP wiped it out over time and was killing the new one. The replacement would have done the same if he hadn't verified that the delivery pressure was low before continuing to drive it with crappy response and power again. Fwiw.... he had ZERO delivery pressure at the test port and that truck was pulling trailers like that... I didn't see it in the diagnosis, but has the lift pump been verified as solid, or not? [/QUOTE]

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