Yamaha - Diaphragm - Fuel Pump System - 6E5-24411-10-00

Overview

On these smaller Yamaha outboards, the fuel pump diaphragm does a lot of quiet work behind the scenes. When it starts to stiffen or crack, you’ll feel it right away—hard starts, uneven idle, or the motor just not getting the fuel it needs. It’s one of those parts that’s easy to overlook until performance drops off. Replacing it brings the fuel system back to life and keeps things running steady out on the water.

Key Features

• Flexible Fuel Transfer Design – Moves fuel efficiently through the pump with consistent pressure.
• OEM Material Construction – Built to handle fuel exposure and repeated flex without breaking down early.
• Consistent Engine Response – Helps maintain smooth idling and reliable throttle performance.
• Direct Fit Replacement – Matches original dimensions for proper sealing and straightforward installation.

Engine & Boat Compatibility

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

FAQ

Q: What are the signs of a failing diaphragm?
A: You’ll usually notice poor starting, sputtering at idle, or the engine starving for fuel at higher speeds.

Q: Can this part affect fuel economy?
A: Yes, a worn diaphragm can disrupt fuel delivery, causing inefficient burn and higher fuel use.

Q: Is this a difficult install?
A: Not really—just take your time opening the fuel pump and make sure everything lines up when reassembling.

Q: How often should this be replaced?
A: It depends on use, but many replace it during routine fuel pump service or when performance drops.

Q: Does saltwater use impact this part?
A: Indirectly—salt can affect surrounding components, so keeping the system clean helps the diaphragm last longer.