Ram 1500 EcoDiesel MOPAR Fuel Filter - Geno's Garage Description. OEM direct replacement fuel filter for '14-'19 Ram 1500 EcoDiesel trucks. See our video about how to do a "No Mess" fuel filter change on your truck. Mopar Factory Fuel Filter | 14-18 Ram 3 EcoDiesel The owner's manual recommends replacing the factory fuel filter in your EcoDiesel every 30,000 miles or three years, whichever comes first. However, if you know that you picked up any fuel that could be contaminated or your water in fuel indicator appears on the dash, you will want to replace it immediately.