This is the AirDog I FP-150 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. A 1/2″ draw straw is used to pull fuel from the tank. The supply side is hooked up to the factory fuel line feeding the CP4 injection pump. The return is sent back to the tank through a filler neck tee. This is a 150GPH (Gallon Per Hour) fuel system.