Evap leaks can be kind of tricky. To assume that it may be the canister is probably false. To diagnose it, you either need a scan tool, or an evap tester that pressurizes the system with smoke, or both. Check your fuel cap, if it don't have a very positive ratcheting lock, it may not be getting tight enough. Possibilities include the vent solenoid, purge solenoid, fuel tank pressure sensor, fuel sender seal, hoses/tank/and connections, canister, filler neck, and cap. With a scan tool, you can possibly do a purge and seal function while watching the tank pressure data, perform some quick checks and monitor for improvements.
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Friday, January 22nd, 2010 AT 11:11 PM