Canister structure and method of regenerating a canister for a fuel vapor retaining system

摘要

A branch pipe 57 is coupled to a middle portion of an outside-air connection pipe 52. A fresh-air inlet 57a of the branch pipe 57 opens into the outside air. A check valve 58 is provided in the branch pipe 57. The check valve 58 restrains air in the outside-air connection pipe 52 from flowing out into the outside air via the branch pipe 57 and allows the outside air to flow into the outside-air connection pipe 52 via the branch pipe 57 when an inside pressure of the outside-air connection pipe 52 decreases to a specified negative pressure. The fresh-air inlet 57a of the branch pipe 57 is positioned at a specified level higher than a fresh-air inlet 52a of the outside-air connection pipe 52 and disposed in a space 73 formed between wheel house panels 71a, 71b and a mud guard 71c.