How to Replace a Fuel Filter on a 1999 Dodge 1500 | It The fuel filter on the 1999 Dodge 1500 requires a different replacement process than on most Dodge Rams from other model years. The function of the fuel filter on the Dodge Ram is to filter any sediments from the gas before the gas reaches the fuel injectors and the engine. 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.