Fuel Filters for GMC and Chevy Duramax Diesel Trucks Buy Your Duramax Diesel Truck Fuel Filters at MadJack Diesel. Buying fuel filters for GM Duramax diesel trucks can be expensive. We’re truck people and love the GM Duramax, but we know it can take a lot of work to maintain a Duramax pickup truck. How to Replace Your Truck's Diesel Fuel Filter wwwyourself››Auto Repair›Truck RepairAll diesel trucks come installed with a diesel fuel filter to extract the best performance out of their engine by supplying clean and filtered fuel into the combustion cylinders. For any diesel engine, the primary equipment of defense to outside dust, dirt and other contaminants entering the combustion cylinders from the fuel tank is the fuel filter.