This is the AirDog II-4G DF-100 fuel system for the 1989-1993 12V VE-44 5.9L Cummins. This system mounts to the frame rail using the supplied sandwich plate mounting system. The suction side hooks up to the factory suction fitting in the fuel module. The pressure side connects directly into the side of the injection pump, bypassing the factory fuel filter housing and factory , block mounted, fuel pump. The AirDog Air/Vapor return is sent back to the tank through a filler neck tee. This is a 100GPH (Gallon Per Hour) fuel system for stock fuel trucks.