16730-ZX2-033 Vapor Separator - Overview. The 16730-ZX2-033 Vapor Separator is an essential component in Honda marine engine systems. Specifically designed to prevent water vapor from contaminating your fuel, this separator ensures that only clean fuel reaches the engine, maintaining smooth operation and reliable performance. It plays a crucial role in the fuel system by separating and removing vapor and water before it can negatively impact engine efficiency or cause damage. Engineered by Honda