Yamaha - Diaphragm Fuel Pump System 6E5-24411-10-00. Overview. On these smaller Yamaha outboards, the fuel pump diaphragm does a lot of quiet work behind the scenes. When it starts to stiffen or crack, you'll feel it right away-hard starts, uneven idle, or the motor just not getting the fuel it needs. It's one of those parts that's easy to overlook until performance drops off. Replacing it brings the fuel system back to life and keeps things running steady out on the water.. Key Features. Flexible Fuel Transfer Design - Moves fuel efficiently through the pump with consistent pressure.. OEM Material Construction - Built to handle fuel exposure and repeated flex without breaking down early.. Consistent Engine Response - Helps maintain smooth idling and reliable throttle performance.. Direct Fit Replacement - Matches original dimensions for proper sealing and straightforward installation.. Engine & Boat Compatibility. Designed for Yamaha 2-stroke outboard engines using diaphragm-style fue