Yamaha - Diaphragm - Fuel Pump System - 6E5-24471-01-00

Overview

This is one of those parts you don’t see working, but you definitely notice when it stops doing its job. The diaphragm keeps fuel moving through the pump with every pulse of the engine, and once it wears out, performance drops off fast. I’ve seen engines go from running fine to struggling at idle just because this piece got stiff or cracked. Replacing it is a simple way to bring back steady fuel flow and dependable running.

Key Features

• Responsive Fuel Pump Action – Flexes with engine pulses to move fuel consistently through the system.
• Durable Rubber Construction – Built to handle repeated movement and long-term fuel exposure.
• Maintains Engine Stability – Supports smooth idling and steady throttle response.
• Exact Fit Replacement – Designed to match original specifications for proper sealing and installation.

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 general-purpose fishing boats.

FAQ

Q: What are the early signs of diaphragm failure?
A: You’ll usually notice rough idle, hesitation when accelerating, or inconsistent fuel delivery.

Q: Can this part cause the engine to stall?
A: Yes, especially at low speeds where steady fuel flow is critical.

Q: Is this something I should replace preventively?
A: It’s a good idea during fuel pump service, especially if the engine has a lot of hours.

Q: Does storage affect the diaphragm?
A: Long periods without use can cause it to dry out or stiffen, especially with old fuel in the system.

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