| 摘要 |
PROBLEM TO BE SOLVED: To control the flow rate in a control valve with ease. SOLUTION: A valve device 34 comprising a large caliber oil supply valve 30 and a small caliber pressure relief valve 32 provided in parallel with each other is arranged at a portion on the fuel tank body side in a breather line 28 connecting the fuel tank body 10 and a canister 26. The caliber of the oil supply valve 30 is adjusted to the size allowing the flow rate of the evaporated gas passing through the oil supply valve 30 to become the flow rate that allows the pressure relief of the fuel tank body 10 to complete in a specified time, and the caliber of the pressure relief valve 32 is set to the size allowing the flow rate of the evaporated gas passing through the pressure relief valve 32 to be limited to the flow rate which allows it to be able to be sucked in the canister 26.
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