2012 Dodge Ram Replacement Fuel Filters – CARiD Dodge Ram 2500 / 3500 2012, ProGuard D2 Fuel Filter by aFe®. Pro GUARD D2 Fuel Filters deliver increased flow and efficiency that are demanded in the Diesel environment. This fuel filter is designed for maximum filtration and minimal.. Where Is the Fuel Filter on a Dodge RAM Located Most Dodge Ram owners are quite shocked to learn that the fuel filter is located inside the gas tank. It can be quite costly to replace since the entire unit must be replaced and the gas tank removed in order to do so. To replace a fuel filter on a Dodge Ram with a gasoline engine, remove the fuel pump relay from the power distribution center.