Yamaha - Injection Pump Assembly Fuel Delivery System YF1-60065-10-12. Overview. When you're dealing with fuel-injected Yamaha engines, the injection pump is what keeps everything running clean and consistent. I've seen engines lose power or start acting unpredictable when the pump isn't delivering fuel the way it should. The Yamaha Injection Pump Assembly YF1-60065-10-12 is what keeps fuel moving at the right pressure so the engine performs the way it's supposed to. When this part is working ri