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Are you running an aftermarket fuel pressure regulator? I have an Isis adjustable FPR and I have the same issue with my fuel pressure dropping to zero after the fuel pump primes. This was not an issue with my stock FPR. I did have a guy on another forum tell me that all aftermarket FPRs he has ran do not hold pressure after the fuel pump is done priming though so I don't know what to think.
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