17620-881-053 Fuel Filler Cap - Overview. The 17620-881-053 Fuel Filler Cap is a critical component supporting Honda marine engine fuel systems. This OEM part is designed to securely seal the fuel tank opening, preventing fuel spillage, contamination, and vapor leakage. By maintaining a tight seal, it helps ensure stable fuel system function and overall engine reliability. Manufactured to match precise factory specifications, the cap integrates seamlessly with existing fuel hardware to maintain