FUEL SUPPLY DEVICE

PROBLEM TO BE SOLVED: To provide a fuel supply device that has improved durability and productivity, can suppress leak of fuel vapor and can secure device characteristics.SOLUTION: A fuel supply device 1 includes a tank lid 10 for closing a through hole 4b on a tank wall 3 of a fuel tank 2, and is fixed to the fuel tank 2 by interposing the tank lid 10 between the tank wall 3 and a fixation member 6 to supply fuel from inside of the fuel tank 2 to outside of the fuel tank 2. An outer peripheral upper surface portion 110a of the tank lid 10 that comes into contact with a lower surface 6c of the fixation member 6 screwed to the tank wall 3 along an outer peripheral portion 112 of the tank lid is arranged on exposed outer surfaces 110, 131 exposed to outside of the fuel tank 2, and an acid-resistant coating film 15 in which surface free energy different from that of the lower surface 6c of the fixation member 6 is set is provided on the outer peripheral upper surface portion 110a.SELECTED DRAWING: Figure 2 【課題】耐久性及び生産性を高めると共に、燃料蒸気漏れを抑制し且つ装置特性を保証する燃料供給装置の提供。【解決手段】燃料タンク２のタンク壁３において貫通孔４ｂを閉塞するタンク蓋１０を備え、タンク壁３と固定部材６との間にタンク蓋１０が介装されることで燃料タンク２に固定され、燃料タンク２内から燃料タンク２外へ向かって燃料を供給する燃料供給装置１において、タンク蓋１０は、その外周縁部１１２に沿ってタンク壁３に螺着される固定部材６の下面６ｃと接触する外周上面部１１０ａを、燃料タンク２外に露出する露出外面１１０，１３１において有し、当該外周上面部１１０ａには、固定部材６の下面６ｃとは異なる表面自由エネルギーを設定する耐酸性塗膜１５が、設けられる。【選択図】図２