With the common rail 5.9L fuel system, fuel filtration is key to ensuring a long life out of your injectors and injection pump. Small contaminates in the fuel can lead to big problems. Replace your stock 10-micron fuel filter in your 5.9L Cummins with this upgraded 7 micron replacement fuel filter from Fleetguard. This filter exceeds factory specifications and is a direct replacement for the stock fuel filter canister.