Yamaha - Diaphragm Assembly 1 Fuel System Component 6L2-14368-00-00. Overview. When fuel delivery starts getting inconsistent, especially on smaller carbureted Yamahas, the diaphragm is often the issue. These wear out over time from constant flexing, and once they do, the engine just won't run right. I've seen motors struggle with hesitation and poor idle that came down to this exact part. Replacing it brings fuel flow back under control and gets the engine running smooth again.. Key Features. Regulates Fuel Movement - Controls fuel flow within the system for consistent engine performance.. Flexible Diaphragm Design - Built to respond quickly to pressure changes during operation.. Durable Material Construction - Designed to withstand fuel exposure and repeated flexing.. Factory-Spec Fitment - Matches Yamaha fuel system components for proper operation.. Restores Fuel System Performance - Helps eliminate hesitation, rough idle, and uneven running.. Engine & Boat Compatibility. Designed f