check the out fuel pressure specs. and that will tell you the difference if any at all. compare the two pressures call a dealer and see if there is a great pressure difference and if there is a higher pressure on the one you installed get a reg and install on the out line and set to specs jegs.com sells fuel regulators. just check current rating on the replacement relay and see if it has a higher rated contacts then you will be fine. sorry misread you question i thought you had replaced a fuel pump.