Yamaha - Diaphragm Fuel Pump System 6E5-24411-00-00. Overview. This is one of those small parts that can cause big headaches when it starts to wear out. The diaphragm is what keeps fuel moving through the pump, and when it stiffens or cracks, the engine just won't run right. I've seen motors come in with random stalling or weak throttle, and it traces right back to this piece. Replacing it brings the fuel system back to life and keeps things running smooth out on the water.. Key Features. Consistent Fuel Delivery - Maintains steady fuel flow through the pump for reliable engine operation.. Flexible Rubber Construction - Designed to flex repeatedly without breaking down under normal use.. Fuel-Resistant Material - Built to handle constant exposure to gasoline and additives.. Direct Fit Replacement - Matches original specifications for proper sealing and easy installation.. Engine & Boat Compatibility. Designed for Yamaha 2-stroke outboard engines using diaphragm-style fuel pumps. Common