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Loose hose/fitting sucking air someplace? Connecting directly may be bypassing a relay or sensor that won't let it pump unless there is fuel pressure and although you are forcing it to pump it is still sucking some air preventing the proper build up in the rails.
Wild guess but I have had fuel pumps that would not draw due to air leaks before.
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Racecar spelled backwards is Racecar, because Racecar.
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