Join Date: Mar 1999
Location: The Island of Luzon
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fuel check valve is in the pump discharge.
The FPR has a soft seat that seals when the pressure drops and stops bypassing.
If you shut the car off and put a clamp on the return line under the FPR, and the pressure stays at 30 or whatever it was while running, then it's the FPR Seat that is weeping and losing pressure making for hard restarts.
If clamping the line doesn't stop it bleeding out to zero, then the fuel check valve in the discharge of the pump is leaking (or your internal bypass is not reseated after you lifted it at 60psi and showed it flowed deadheaded through the relief valve at 55 psi...)
If you need a pump discharge check valve, you can get them separately (not that go in the pump, they go in the line).
If it's the FPR seat, then you change the FPR.
Vice Grips, fuel pressure gauge, and a couple more starts will sort you out.
What has been will be again, what has been done will be done again; there is nothing new under the sun -- that means
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