| 摘要 |
PROBLEM TO BE SOLVED: To provide a resin-made valve cover capable of being easily melt- bonded to a resin-made fuel tank main body and having a function to restrict dissipation of a fuel gas. SOLUTION: A fuel-contacting side of a resin-made valve cover is formed of a first resin showing small permeation of the fuel, a fuel-noncontacting side thereof is formed of a second resin showing a welding property to the outer layer of the fuel tank and the welded portion to the fuel tank and a barrier layer to the fuel gas are formed of different resins respectively whereby the resin-made valve cover can be easily welded to a mouth portion for attachment of the valve of the fuel tank and it is possible to prevent permeation of the fuel gas through the resin-made valve cover and restrict dissipation of the fuel gas. |
