Have you checked the fuel pressure, and your filter? How can you be sure it's working on manual? Even if the system isn't working the light will come on in manual.
'01 F350, lariat LE, cc, lb, drw, TSP 6pos. chip w/ swamps ss tunes, FF stage 1.5, MBRP 4" turbo back, cooling mist water injection.
Check the forum for info on the pressure switch there has been a problem with them. This is the same symtom that my system had when this pressure switch went out. If this is the problem the guys will send out a new one.
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