17622-ZV0-000 Fuel Cap Inner - Overview. The 17622-ZV0-000 Fuel Cap Inner is a critical component for Honda marine engine fuel systems. It functions as the inner part of the fuel cap assembly, designed to ensure a secure and sealed closure for the fuel tank. By maintaining a proper seal, it plays a vital role in preventing fuel leakage and contamination, thus supporting consistent and reliable operation of Honda marine engines. This part is engineered to fit precisely within the existing fuel sy