How to Change the Fuel Filter on a Push Mower | Home Position the new fuel filter so the arrow on the filter is pointing towards your carburetor. Reattach the fuel line to one end of the filter and attach the other end of the filter to the carburetor. How to change a fuel filter in small engines? | Briggs If debris is clogging the mesh screen, pleated paper or the inside of the casing, replace the old filter with a new replacement fuel filter. When replacing the fuel filter, be sure to reconnect the metal clips on both sides of the filter. Remove the clamp on the fuel line or reopen the fuel valve when the fuel filter is secure. Check for leaks.