Bleeding down the pressure in the fuel system can really only be the pump's check valve (built in it), the filter/lines leaking, the regulator, or the injectors themselves. My 95 24V 6G72 had hard starting and was the original pump's check valve bleeding down instantly, and replacing the pump solved it.
My second Montero (a 94 12V 6G72) has a good pump and pressure with little bleed down, but the ECU doesn't send the prime signal on key on engine off, and the IACV setup is slow to respond when dead cold, similar symptoms but different reasons.