Yamaha - In-Line Fuel Filter Fuel System 68T-24251-01-00. Overview. Clean fuel is one of the simplest ways to keep a small Yamaha four stroke running smoothly. The Yamaha 68T-24251-01-00 In-Line Fuel Filter installs directly in the fuel line between the tank and the engine, catching debris before it reaches the carburetor or fuel system. Dirt, water, and contaminants can easily make their way into portable fuel tanks, especially on smaller boats. Replacing the inline filter during routine servic