PURPOSE: To prevent a high boiling point fraction of liquid fuel from sticking to an adsorbing material and thereby to prevent deterioration of the adsorbing material, by providing a separating chamber for separating a vapor phase from a liquid phase in a passage leading from a tank port communicated with a fuel tank to the adsorbing material, and thereby permitting vaporized fuel only to be introduced to the adsorbing material in a canister.
CONSTITUTION: There is provided a second partition wall 20 connected to a casing 10 at both ends thereof between an opening portion inside of the casing of a tank port 13 of the casing 10 and a first diffusion chamber 12 on an inlet side in a canister. Further, a separator chamber 21 which the tank port 13 is opened into is formed between the second partition wall 20 and the casing 11. The second partition wall 20 is provided with a first passage 22 communicated with the first diffusion chamber 12. Liquid fuel as flown in upon rapid turning of a vehicle is introduced to the separator chamber 21, and vaporized fuel only is adsorbed through the first passage 22 to an adsorbing material 10. Therefore, the adsorbing material 10 is not deteriorated by the liquid fuel.
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