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Re: Fuel Pressure Regulator - Ruptured Diaphram
When the engine is off, there should be zero pressure on the return line at the fuel pump module connection. You might experience some fuel running out, but not under any pressure, gravity only. If it has pressure, (fuel sprays out) at that connection, there is a restriction in the fuel pump module. A kink in the EVAP system could cause vacuum in the tank, but certainly not pressure. If you remove the return line at the fuel metering block, and at the tank, you should be able to blow through it very easily. Might want to double check the line where it was kinked.
FYI: The fuel pump maximum output pressure should be 73psi to 108psi, more than enough to rupture the diaphragm if restricted downstream of the regulator.
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