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 used on smaller to mid-range horsepower motors found on skiffs, jon boats, and fishing setups.

FAQ

Q: What are the signs of a failing diaphragm?
A: Rough idle, hesitation during acceleration, or inconsistent fuel flow are common signs.

Q: Can this cause the engine to lose power?
A: Yes, especially under load when the engine needs steady fuel delivery.

Q: Should I replace this during fuel pump maintenance?
A: It’s a good idea, especially if the engine has a lot of hours on it.

Q: Does old fuel affect the diaphragm?
A: Definitely—stale fuel can cause it to stiffen or degrade faster.

Q: What should I watch for during installation?
A: Make sure it’s seated correctly and the pump is evenly reassembled to avoid leaks.