17633-ZVD-000 Fuel Cap Tether - Overview. The 17633-ZVD-000 Fuel Cap Tether is a genuine OEM Honda part designed to support the fuel system of Honda marine engines. This tether system secures the fuel cap to the fuel filler of your boat, ensuring that the cap stays firmly attached and preventing it from being lost during operation or refueling. By providing a reliable connection, it helps maintain the fuel system's integrity and supports uninterrupted marine engine performance. It ensures seamle