Yamaha 8mm Primer Pump Assembly 6AW-24360-01-00. Overview. The Yamaha 6AW-24360-01-00 8mm Primer Pump Assembly is an essential fuel system component designed to help prime the engine before starting. By manually pumping the primer bulb, fuel is pulled from the fuel tank and pushed through the fuel lines toward the engine, ensuring proper fuel delivery and eliminating air from the system.. Over time, primer bulbs and internal check valves can deteriorate due to exposure to fuel, heat, and UV cond