16861-ZVT-S10 Fuel Tube B - Overview. The 16861-ZVT-S10 Fuel Tube B is an essential component of the Honda marine fuel system responsible for safely and efficiently transporting fuel within the engine system. As a critical connection tube, it supports the fuel delivery mechanism, ensuring consistent fuel flow from the tank to the engine's fuel injection system or carburetor. Designed for Honda marine engine systems, it ensures seamless integration with existing parts, maintaining optimal perform