This is the Raptor-4G RP-150 fuel system for the 2003-2004.5 Common Rail Cummins without the factory fuel pump in the fuel tank. This system mounts to the frame rail using the supplied sandwich plate mounting system. The suction line connects to the factory suction fitting on top of the fuel module. The pressure side connects directly into the side of the fuel filter housing on the engine block. These pumps are internally regulated and do not require a return line. This is a 150GPH (Gallon Per Hour) fuel system for moderately modified trucks. Check out our installation manual for a list of parts that are included with this kit.