Fuel filters in carbureted models must be replaced according to the maintenance interval suggestions and when a blockage in the fuel line occurs due to excessive foreign material in the fuel. Given the volatile nature of gasoline, precautions should be exercised when the fuel filter is replaced. This work should be done on a cool engine, away from open flames and not within an enclosed area. Any spills should be cleaned up immediately. Fuel filters are located in different places depending on the year, engine size and weight rating of the vehicle. Most can be found in-line somewhere between the fuel pump and the carburetor. If a fuel filter is located in-line between the carburetor and the fuel pump, it is usually connected with rubber hoses. After removing the filter, drain it and discard it in a non-incendiary refuse container. Replace the filter with an exact duplicate replacement and push it into new rubber connecting hoses. Tighten all clamps, start the vehicle and check for leaks. If the filter is the type located in the inlet of the carburetor, first detach the line leading to the inlet. Carefully unscrew the carburetor inlet filter unit from the carburetor. To reinstall, simply thread a new filter into the carburetor and tighten securely. If an internal filter is located inside the carburetor inlet, the spring, gasket and filter must be removed. Assemble the new filter, seal and spring in the reverse order of their removal. Some fuel filters are located in the bottom of the fuel pump. To remove this type of filter, unscrew the canister from the bottom of the fuel pump. Slowly lower the canister and filter assembly off the bottom of the fuel pump. Empty the fuel into an approved gasoline container, then remove the filter and gasket assembly. Insert a new filter and gasket assembly. Screw the filter and filter housing assembly back on to the base of the fuel pump. Start the vehicle and check the filter and surrounding area for leaks.