This is the Raptor-4G RP-100 fuel system for the 2001-2010 6.6L Duramax. 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 to the factory injection pump feed line on the frame back by the fuel cooler. These pumps are internally regulated and do not require a return line. This is a 100GPH (Gallon Per Hour) fuel system for stock fuel trucks.