Yamaha - Diaphragm Fuel Pump System 6E5-24471-00-00. Overview. This is one of those parts that quietly keeps your fuel system working right until it doesn't. The diaphragm flexes constantly with engine pulses, and over time it can stiffen up or wear out. When that happens, fuel delivery gets inconsistent and the motor just won't run like it should. I've seen a simple diaphragm swap bring an engine right back to smooth, reliable performance.. Key Features. Consistent Fuel Pump Operation - Maintains steady fuel movement through the system for reliable performance.. Flexible Rubber Construction - Designed to handle constant pulsing without losing effectiveness too quickly.. Fuel-Resistant Material - Built to withstand long-term exposure to gasoline and additives.. OEM Fit and Seal - Matches original specifications for proper installation and dependable sealing.. Engine & Boat Compatibility. Designed for Yamaha 2-stroke outboard engines using diaphragm-style fuel pump systems. Commonly use