| 摘要 |
PROBLEM TO BE SOLVED: To prevent occurrence of evaporative fuel in a fuel storage space in a fuel storage device. SOLUTION: A fuel storage space 23 for storage fuel is formed by a pair of approximately polygonal walls 10a, 10b and approximately rectangular walls 10c-10f for mutually connecting the sides of these polygonal walls 10a, 10b. The volume of the fuel storage space 23 is changed by deforming the polygonal and rectangular walls according to a fuel amount in the fuel storage space 23. Dimension of each rectangular wall is smaller than that of one polygonal wall. An opening 25 through which fuel can flow is arranged in the rectangular wall, and a fuel passage 12 is connected to the opening 25.
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