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Message: <blockquote data-quote="someotherguy" data-source="post: 20310" data-attributes="member: 6178">My now-departed '06 Intimidator SS has a persistent P0455.  First thing I did, like most, is replace the cap.  Then the vent solenoid/filter following the TSB with the updated parts and relocation of the filter to prevent dirt intrusion.  Then the purge solenoid.I figure the previous owner must have overfilled the tank frequently and damaged the canister.  Never got around to replacing it as Texas lets you pass emissions test with 1 monitor "not ready" so every year when inspection time came around, I'd fill the tank, clear the codes, then next day on cold start it'll ready the O2 heater monitor, a little driving readies the others, a short trip gets them all in line except of course the evap system.  Then to the inspection.. before it gets down to 75% tank and runs the evap test, which will set the code again.Told the buyer this yesterday, full disclosure.  He's had lots of GM's including several 800's so he knows the routine.Richard</blockquote>