Yamaha - Fuel Pump Diaphragm Fuel Delivery Component 6H4-24411-00-00. Overview. When a motor starts acting like it's not getting enough fuel, this is one of the first things I check. The diaphragm does all the work inside the fuel pump, flexing constantly to keep fuel moving. Over time, they get stiff or worn, especially with today's fuel. It's a small part, but when you replace it, you can feel the motor come back to life.. Key Features. Pulse-Driven Fuel Operation - Uses engine pressure pulses to move fuel through the system.. Flexible Performance Material - Designed to flex consistently for steady fuel delivery.. OEM Fit and Seal - Built to Yamaha specifications for proper installation and sealing.. Restores Fuel Pump Efficiency - Helps eliminate fuel starvation and uneven engine behavior.. Ideal Maintenance Component - Common replacement during fuel pump service or rebuilds.. Engine & Boat Compatibility. Designed for Yamaha outboards equipped with compatible fuel pump systems. Comm