For anyone that has the CEL code P0455 (Large fuel vapor leak in the evap system) I fixed mine today since my inspection is up at the end of March. I figured I would post my fix to help out someone else. I've had this problem for several months.
I started with the gas cap since that was the general consensus on here. No dice. Then I replaced the charcoal canister and purge solenoid, still leaking. Then I traced every hose that I could see from the large canister under the bumper cover all the way back to the gas tank. Still could not find a cracked/dry rotted hose
So today I finally broke down and got a smoke test. Turned out to be the steel
evap line right above the driver side wheel well. It's down in the crevasse under the hood hinge, where it started to rust through and mud/debris had got in there and the line had snapped right in half. Put six inches of rubber hose on with a couple hose clamps and problem solved. The computer found no faults and inspection was a success.
Hopefully this will help someone in the future