16730-ZW5-063 Vapor Separator - Overview. The 16730-ZW5-063 Vapor Separator is an essential component in Honda marine engine systems. Its primary role is to separate vapor from fuel within the fuel system, ensuring that only liquid fuel reaches the engine. This separation is crucial for reliable engine operation and performance, as vapor in the fuel lines can lead to engine hesitation, stalling, or damage. Designed specifically for Honda marine engines, this vapor separator integrates seamlessly