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A vaporized-fuel processing device for an engine stabilizes the idling operation wherein vaporized fuel within a fuel reservoir is adsorbed to an adsorbing member of a canister. While the engine is in operation, air is sucked from an air inlet into the canister with the intake-air negative pressure

A vaporized-fuel processing device for an engine stabilizes the idling operation wherein vaporized fuel within a fuel reservoir is adsorbed to an adsorbing member of a canister. While the engine is in operation, air is sucked from an air inlet into the canister with the intake-air negative pressure produced in an intake-air passage. This air separates the vaporized fuel adsorbed to the adsorbing member of the canister. Purge gas resulting from mixing the vaporized fuel into the air is sucked from a purge-gas sucking port into the intake-air passage. A throttle valve is arranged in a throttle intake-air passage of a throttle body. An intake-air pipe is disposed intake-upstream of the throttle body and is communicated with the throttle intake-air passage. The intake-air pipe has a peripheral wall to which a purge-gas sucking pipe is detachably attached. The purge-gas sucking port is provided within the purge-gas sucking pipe.

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1. A vaporized-fuel processing device for an engine, comprising a canister (1) provided with a vaporized-fuel inlet (2) and with an air inlet (3) as well as with a purge-gas outlet (4), the vaporized-fuel inlet (2) being communicated with the vaporized-fuel outlet (6) of a fuel reservoir (5) and the

1. A vaporized-fuel processing device for an engine, comprising a canister (1) provided with a vaporized-fuel inlet (2) and with an air inlet (3) as well as with a purge-gas outlet (4), the vaporized-fuel inlet (2) being communicated with the vaporized-fuel outlet (6) of a fuel reservoir (5) and the air inlet (3) being communicated with the air, the purge-gas outlet (4) being also communicated with the purge-gas sucking port (8) of the intake-air passage (7), the vaporized fuel (9) within the fuel reservoir (5) being adsorbed to an adsorbing member of the canister (1), while the engine is in operation, the intake-air negative pressure produced in the intake-air passage (7) being made to suck the air (10) from the air inlet (3) into the canister (1), the air (10) separating the vaporized fuel (9) adsorbed to the adsorbing member of the canister (1), the purge gas (11) resulting from mixing the vaporized-fuel (9) into the air (10) being sucked from the purge-gas sucking port (8) into the intake-air passage (7), wherein a throttle body (12) is arranged in the intake-air passage (7) and has a throttle passage (13), which is provided with a throttle valve (14),an intake-air pipe (15) is arranged intake-upstream of the throttle body (12) and is communicated with the throttle intake-air passage (13), the intake-air pipe (15) having a peripheral wall (16) to which a purge-gas sucking pipe (17) is detachably attached, the purge-gas sucking port (8) being provided within the purge-gas sucking pipe (17),during the engine's operation, in order for the intake-air negative pressure produced in the intake-air passage (7) to suck blow-by gas (20) from a breather chamber (19) to the intake-air pipe (15),a blow-by gas sucking pipe (18) is communicated with the breather chamber (19),the intake-air pipe (15) has a horizontal pipe portion (15a) to an upper peripheral wall (15b) of which the purge-gas sucking pipe (17) is attached diagonally downwardly,the intake-air pipe (15) has the horizontal pipe portion (15a) to the upper peripheral wall (15b) of which the blow-by gas sucking pipe (18) has a blow-b gas outlet passage (18a) attached diagonally downwardly,the blow-by gas sucking pipe (18) and the purge gas sucking pipe (17) are arranged dividedly in the left and right direction and the blow-by gas outlet passage (18a) of the blow-by gas sucking pipe (18) and the purge-gas sucking pipe (17) are inclined downwardly in the direction that brings them toward each other, andthe purge-gas sucking pipe (17) is arranged so that it is positioned away from an intake-downstream side of the blow-by gas sucking pipe (18). 2. The vaporized-fuel processing device for an engine as set forth in claim 1, wherein a choke valve (26) is arranged upstream of the throttle valve (14) in the throttle intake-air passage of the throttle body (12). 3. The vaporized-fuel processing device for an engine as set forth in claim 1, wherein the throttle body (12) has an intake-air inlet portion (12a) connected to an intake-air outlet portion (15c) of the intake-air pipe (15), to which the purge-gas sucking pipe (17) is attached. 4. The vaporized-fuel processing device for an engine as set forth in claim 3, wherein the intake-air pipe (15) has the intake-air outlet portion (15c), which is formed from a pipe portion of an inner diameter unvariable.