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Q: codes 446 and 451. no driveability problem but hard to start after each fuelfill on 2007 Hyundai Accent

starts fine between fuel fulls. Check engine light is on.
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It is codes about purge flow solenoid. When you open gas cap, the solenoid is not completely closed and it draw raw fuel from charchoel canister. The purge solenoid is the most common problem

Suwanee Auto Repair
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