Yamaha - Diaphragm - Fuel Pump System - 6E5-24411-01-00

Overview

This is one of those small fuel system parts that can quietly cause big performance issues when it wears out. The diaphragm is constantly flexing as the engine runs, and over time it can lose its shape or develop small cracks. When that happens, fuel delivery gets inconsistent, and you’ll feel it right away on the water. Swapping it out is a simple way to bring the engine back to smooth, reliable operation.

Key Features

• Consistent Fuel Movement – Maintains steady fuel flow through the pump for dependable engine performance.
• Flexible Rubber Design – Built to handle constant pulsing without losing its shape too quickly.
• Fuel-Resistant Material – Designed to withstand prolonged exposure to gasoline and additives.
• OEM Fit and Seal – Matches original specifications to ensure proper installation and sealing.

Engine & Boat Compatibility

Designed for Yamaha 2-stroke outboard engines equipped with diaphragm-style fuel pumps. Commonly used on smaller horsepower motors found on skiffs, jon boats, and utility fishing setups.

FAQ

Q: What are common signs this diaphragm needs replacing?
A: Rough idle, hesitation when accelerating, or inconsistent fuel delivery are typical signs.

Q: Can this part cause loss of power?
A: Yes, especially at higher speeds where steady fuel flow is critical.

Q: Is it worth replacing even if it looks okay?
A: If the engine has hours on it, many techs replace it during fuel pump service to avoid future issues.

Q: Does old fuel affect the diaphragm?
A: Definitely—stale or contaminated fuel can speed up wear and cause it to stiffen.

Q: What should I be careful about during installation?
A: Make sure it’s seated properly and the pump is evenly tightened to avoid leaks or poor performance.