Can the purge solenoid potentially stick in the open position?
Is the gas pump clicking off multiple times before the tank is full when you're filling up? I expect the answer to be no, but please confirm.
It could stick open, but both the new and old purge solenoids test correctly on the bench, and respond to the various commands that can be done with the Tech 2.
And no issues filling up. Hoping the canister has a small crack or some such thing. The vacuum decay isn't instantaneous, it takes 7 to10 seconds to get back to neutral pressure.