| 摘要 |
PURPOSE: To reduce the volume of a fuel tank by a pressure inside an internal space by surrounding either of spaces formed between a fuel storage part and a fuel tank inner wall by a bag-shaped extensible film made of flexible material and separating them from each other, and connecting the pressure inside the space part to a pressure regulating device for maintaining the pressure at a pressure higher than the atmospheric pressure. CONSTITUTION: An expansible and contractible fuel storage part 2 surrounded by a bag-shaped extensible film 3 made of flexible material such as rubber is stored in a fuel tank 1 of enclosed structure. When a pressure in an internal space 9 inside the fuel tank 1 located around the fuel storage part 2 is reduced to below atmospheric pressure, an atmospheric pressure relief valve 28 of a pressure regulating device 26 is opened. Also, when a pressure inside the internal space 9 exceeds a specified positive pressure higher than the atmospheric pressure, a positive pressure relief valve 27 of a pressure regulating device 26 is opened. The positive pressure relief valve 27 is provided between the internal space 9 and the outside air so as to maintain a pressure inside the fuel tank 2 always at the atmospheric pressure or more. Thus the volume of the fuel tank 2 can be reduced by the pressure inside the internal space 9.
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