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Evap Help Needed

I need the assistance of someone familiar with Chevy Tahoes. My EVAP system has been causing me nightmares lately. I had an engine code of P0445/P0446 and ended up replacing my charcoal canister, and purge and vent solenoids. That resolved the engine code, but when I go to fill up, I am lucky if I can put a gallon in.…