Yamaha - Diaphragm Fuel System Component 6J8-24471-00-00. Overview. When a fuel system starts acting up-hard starting, uneven idle, or weak throttle response-a worn diaphragm is often behind it. It's a small part, but it controls how fuel moves through the system, so when it gets stiff or damaged, performance drops off fast. I've replaced plenty of these and it's one of those fixes that immediately smooths things out. Keep it fresh, and your motor will run the way it's supposed to.. Key Features. Consistent Fuel Regulation - Controls fuel flow for stable engine operation.. Flexible Material Design - Responds quickly to pressure changes for efficient performance.. Durable Construction - Built to handle fuel exposure and repeated movement over time.. Factory-Spec Fitment - Designed to match Yamaha fuel system components for proper sealing.. Restores Engine Performance - Helps eliminate hesitation, rough idle, and poor fuel delivery.. Engine & Boat Compatibility. Designed for Yamaha outbo