I don't believe it is. One person said that it was, but I don't trust that at all. The car is a Returnless Fuel System. Means the regulator is built into the pump. The idea that all pumps are this way confuses me. Unless the pressure is electrically controlled by the pump. Which I am just not sure of. If thats the case, the pressure sensor on the rail is likely my problem. I need to figure that out I guess. The pressure sensor cosntantly sees good pressure, even when I hook up my gauge set and see, there IS NOT good pressure.