Fuel Filter Location -1999 Dodge Ram 1500 Fuse Box Diagram Fuel Filter Location It is far more helpful as a reference guide if anyone wants to know about the home’s electrical system. Its components are shown by the pictorial to be easily identifiable. is the least efficient diagram among the electrical wiring diagram. How to Replace a Fuel Filter on a 1999 Dodge Ram | It The fuel filter in the 1999 Dodge Ram is located against the firewall, under the hood of the vehicle. Changing the fuel filter at the recommended intervals can ensure that your fuel is clean. Over time the filter can become clogged and rob you of gas mileage due to the lack of fuel making it through the filter.