Patent attributes
A structure of an opening section of a fuel tank, which is capable of detaching a tank cap without damaging positioning projections provided in the tank cap. The opening section has a cylindrical portion extending outwardly from a tank main body, and a metallic annular tank cap engaging member having a plurality of engaging holes is attached to the cylindrical portion. A plurality of engaging claw parts of a metallic annular attaching member are engaged in the engaging holes of the tank cap engaging member to hold the tank cap with the attaching member and the tank cap engaging member. The tank cap has tank cap positioning projections, and the tank cap engaging member has positioning holes for insertion of the tank cap positioning projections, and at least one engaging claw part and at least one engaging hole are respectively made longer in a circumferential direction than remaining engaging claw parts and remaining engaging holes.
