Yamaha - Primary Fuel Filter Fuel System Protection 65L-24563-00-00. Overview. When you rig and service Yamaha outboards every day, you quickly learn that clean fuel keeps engines happy. This Yamaha Primary Fuel Filter is designed to catch debris and contaminants before they reach the engine's fuel system. It's the first line of defense that helps prevent clogged injectors, poor running conditions, and unnecessary fuel system repairs. Many techs replace it during routine service to keep fuel del