16730-ZX2-063 Vapor Separator - Overview. The 16730-ZX2-063 Vapor Separator is a critical component in Honda marine engine systems, designed specifically for fuel vapor separation to support clean and efficient engine operation. It functions by effectively separating vapor from the fuel system, ensuring that only clean fuel reaches the engine, which helps maintain optimal performance and longevity. Engineered to seamlessly integrate with Honda marine fuel systems, this vapor separator ensures re