This is the AirDog I FP-100 fuel system for the 2015-2016 Duramax 6.6L. This system mounts to the frame jig in front of the fuel tank for a clean looking installation. This system utilizes the factory suction port in the fuel module for suction and plugs into the factory fuel line on the pressure side to supply fuel to the CP4 injection pump. The return is sent back to the tank through a filler neck tee. This is one of the easiest fuel systems to install. This is a 100GPH (Gallon Per Hour) fuel system.