Fuel delivery can make or break your day on the water, and the Yamaha Fuel Primer Pump Bulb - 6YK-24360-73-00 / 6YK-24360-72-00 is one of those small but essential components that keeps everything running smoothly. Designed for 8mm fuel lines, this primer bulb ensures your Yamaha outboard gets fuel moving fast — whether you’re firing up after offseason storage or clearing air from the lines after a filter change.

What sets this bulb apart is its marine-grade rubber construction, designed to withstand constant exposure to fuel, including ethanol blends, without hardening or cracking. Internal check valves maintain one-way fuel flow, so every squeeze moves fuel forward without it slipping back into the tank. The textured grip makes handling easy, even when your hands are wet or slick with oil, giving you confident control every time.

Key Features & Benefits:

• Genuine Yamaha part ensures precise fit and reliable performance
• Built for 8mm fuel lines, ideal for a wide range of Yamaha outboards
• Durable rubber resists ethanol damage, swelling, and cracking
• Internal check valves prevent backflow for faster, cleaner priming

Ideal Applications:

1. Priming fuel systems after storage or fuel line maintenance
2. Ensuring quick, reliable engine starts by clearing air pockets
3. Maintaining smooth fuel flow in both freshwater and saltwater conditions

Reliable priming is key to smooth starts, and this Yamaha primer bulb delivers the performance you need — every time the engine fires up.