Upon upgrading your Cummins with an aftermarket fuel pump upgrade that has built-in fuel filter and water separators, such as AirDog or FASS, your factory engine mounted fuel filter is no longer needed, and honestly is both an eyesore as well as a restriction point if you're running your feed line through the stock canister. Why not solve both of these issues by removing it and replacing the void with this Fuel Filter Delete from Fleece Performance?! Tis simple to install block includes two copper washers for a leak free seal and even a port for the WIF (Water In Fuel) Sensor.