17633-ZW6-E10 Fuel Cap Tether - Overview. The 17633-ZW6-E10 Fuel Cap Tether is an essential component of the Honda marine fuel system. This genuine Honda part is designed to securely attach the fuel cap to the fuel tank assembly, preventing loss during refueling and helping to maintain safe and reliable operation of the marine engine systems. By ensuring the fuel cap remains accessible and secure, it supports the integrity of the fuel containment system and overall vehicle safety.. Key Features.