Yamaha Fuel Line Assembly with Primer Bulb 6YK-24306-64-00. Overview. The Yamaha Fuel Line Assembly is designed to deliver a steady and reliable fuel supply from the fuel tank to your outboard engine. Since consistent fuel flow is essential for proper engine operation, this high-quality fuel line assembly helps ensure dependable performance and smooth engine starting.. Built to Yamaha's strict manufacturing standards, this fuel line is constructed with durable materials designed to withstand mar