6AW-24360-02-00 supercedes 6AW-24360-01-00

Yamaha - 8mm Primer Pump Assembly

Overview

The Yamaha 8mm Primer Pump Assembly is designed to help quickly prime the fuel system and deliver fuel to the engine before startup. By manually pumping the primer bulb, fuel is pulled from the tank and pushed through the fuel lines to the engine’s fuel system, helping eliminate air pockets and ensuring consistent fuel delivery.

A properly functioning primer pump is essential for reliable engine starting and smooth fuel flow. Over time, primer bulbs and internal valves can wear, crack, or lose firmness due to fuel exposure and UV damage. Replacing the primer assembly helps restore proper fuel priming performance and keeps the fuel system operating efficiently.

Key Features

• 8mm Fuel Line Compatibility – Designed for Yamaha fuel systems using 8mm fuel lines.

• Improves Engine Starting – Helps prime fuel lines before startup to ensure proper fuel delivery.

• Durable Marine Construction – Built to withstand fuel exposure and marine environments.

• Reliable Check Valve Operation – Maintains fuel flow direction during priming.

Engine & Boat Compatibility

• F250 - 2012-Current
• F300 - 2012-Current
• F350 - 2012-Current
• LF200 / LF225 - 2013-Current
• LF250 / LF300 / LF350 - 2012-Current
• VF200 / VF225 / VF250 - 2012-Current

Why is this prop a strong choice vs. alternatives?

• Correct 8mm Yamaha Fuel System Fit – Designed specifically for Yamaha high-horsepower outboards.

• Improves Fuel System Priming – Helps eliminate air pockets and restore proper fuel delivery.

• Durable Marine Materials – Built to resist cracking, fuel exposure, and harsh marine conditions.

• Supports Reliable Engine Starts – Ensures the fuel system is properly primed before engine ignition.

FAQ

Q: What does a primer pump assembly do?
A: It manually primes the fuel system by pulling fuel from the tank and pushing it toward the engine before startup.

Q: When should a primer bulb be replaced?
A: When the bulb becomes soft, cracked, difficult to prime, or fails to stay firm after pumping.

Q: Can a bad primer pump affect starting?
A: Yes. If the bulb cannot maintain pressure, the engine may struggle to start or may stall.

Q: Why is the correct fuel line size important?
A: Using the proper 8mm fuel line size ensures proper fuel flow and correct fitment within the Yamaha fuel system.

Q: Is this used on high horsepower Yamaha outboards?
A: Yes. It is commonly used on Yamaha F250, F300, F350, and related offshore and VMAX models.