Yamaha Housing, Impeller 2 6FU-51317-00-00. Overview. The Yamaha 6FU-51317-00-00 Housing, Impeller 2 is a genuine OEM component designed to support the water pump assembly and ensure efficient circulation of cooling water through the engine. The impeller housing forms the chamber where the water pump impeller rotates, allowing it to create the pressure needed to move water through the engine's cooling system.. A properly functioning housing helps maintain optimal water pump performance by provid