[old_master]

A rapid leakdown doesn't necessarily mean the fuel pump is faulty. If there are no external fuel leaks, it could be the check valve in the pump, the pressure regulator, or the lines in the plenum. The pump needs to be isolated from the system, somewhere between the pump and the gauge port after the system is pressurized. If the pressure holds, the fuel pump check valve is leaking. If the pressure does not hold, the regulator or fuel lines in the plenum are leaking.