I've replaced the fuel feed line, fuel filter, gas cap, fuel filler neck hose, fuel tank vent hose, and after every application I do It stays off a little longer each time however it still comes on and I'm not sure where to look next, the vacuum line to the fuel pressure regulator has a good suck and idle didn't change any, no fuel residue inside of the vacuum line, and the fuel pump itself doesn't sound like it's got any issue, however I have a feeling that there may be a pressure leak due to a slight fluctuation in the gas gauge, and a very faint fuel smell, maybe a bad gasket/o-ring around the fuel pump?
How long has your 2002 Ford E-150 Econoline had this problem?
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What diagnostic trouble codes (DTC's) are you showing when testing for the concerns? I'm feeling like you might be looking at an evaporative emissions code? I'm not sure, it would be helpful to know that information before giving any thoughts.
