Yamaha - Pump Damper Fuel System Component 6CB-13781-00-00. Overview. This is one of those small pieces that keeps everything running smooth behind the scenes. The pump damper helps absorb vibration and pressure pulses in the fuel system, which keeps delivery steady and predictable. When it starts to wear out, you might not notice it right away-but over time it can lead to rougher operation or inconsistent fuel flow. It's a simple part, but it plays a big role in keeping things dialed in.. Key Features. • Vibration Dampening Design - Reduces fuel system vibration for smoother operation.. • Stabilizes Fuel Flow - Helps maintain consistent pressure and delivery to the engine.. • OEM Fit Accuracy - Matches Yamaha factory specs for proper placement and function.. • Fuel Resistant Construction - Built to handle constant exposure to fuel and engine heat.. Engine & Boat Compatibility. Verify compatibility with your specific Yamaha outboard model and part number before installation.. FAQs. Q1: