Yamaha - Fuel Injection Nozzle Gasket Fuel System 68F-13764-00-00. Overview. Fuel injection systems rely on tight sealing to maintain proper fuel pressure and accurate delivery. The Yamaha 68F-13764-00-00 Fuel Injection Nozzle Gasket seals the injector nozzle to prevent fuel leaks and maintain consistent fuel atomization inside the engine. Over time, heat cycles and fuel exposure can cause gaskets to harden or lose their sealing ability. Replacing worn injector gaskets during service helps maint