An ECU opens a first valve of the first purge line and a second valve of the second purge line to generate an air flow through the first connection passage, the canister and the second connection passage to desorb the fuel vapor from the adsorbent and to purge {HEAD ~ the desorbed fuel vapor} into {TAIL ~ the intake air passage} in an operational period of the supercharging device 
An ECU opens a first valve of the first purge line and a second valve of the second purge line to generate an air flow through the first connection passage , the canister and the second connection passage to desorb the fuel vapor from the adsorbent and to purge { HEAD ~ the desorbed fuel vapor } into { TAIL ~ the intake air passage } in an operational period of the supercharging device
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