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Had a bout of similar problems over a year or so. First main pump failed. Then in-tank pump failed (sign: squealing noise from main pump) Then fuel pressure regulator failed (sign: intermittent engine stalls, main pump variable speed as judged from sounds from it). To work on these things, IMHO; is much like fixing a failing PC: swap each bit with a working PC/car till it works. Suggestion: drive with open window while driving and listen for pump sound, if variable, change FPR. If, instead, main pump is squealing I would suggest failing in-tank pump, clogged-up below-in-tank-pump filter, or perhaps failure in in-tank tubing/connection.
Good luck and donīt despair
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