Mine had a rip in the filler hose where it attached to the tank causing a pressure leak and didn't lose any gas if I didn't top off the tank.
Some great DIY work. Well done!The resolution to this was to replace the Vapor Canister Purge Valve. It is located under the hood, NOT in the rear of the vehicle under the trunk with the reset of the evap system. 1 bolt, 1 hose connection, and 1 electrical connection. Took 2 minutes to replace.