An ECU opens a first valve of the first purge line and {HEAD ~ a second valve} of {TAIL ~ 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 the desorbed fuel vapor into the intake air passage in an operational period of the supercharging device 
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An ECU opens a first valve of the first purge line and { HEAD ~ a second valve } of { TAIL ~ 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 the desorbed fuel vapor into the intake air passage in an operational period of the supercharging device
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