Yamaha - Fuel Primer Pump Bulb Fuel System Priming Component 6YK-24360-73-00 / 6YK-24360-72-00. Overview. Anyone who runs an outboard knows how important a good primer bulb is when it's time to start the engine. The Yamaha Fuel Primer Pump Bulb 6YK-24360-73-00 / 6YK-24360-72-00 helps move fuel quickly from the tank to the engine so you're not cranking longer than you should. It's especially helpful after the boat has been sitting or anytime the fuel system has been opened for service. With a sol