That is incorrect, dont listen to whoever is filling your gas tank. That is what lead to this whole problem. The gas handle at the station is designed to shut off at a certain point. If you pull the handle out to try to fill it as much as you can, you over fill the gas tank. There are certain valves at the top of the tank that are designed to close when the tank is full, When the tank gets overfilled, the gas floods the Charcoal Canister which is only designed to handle to fuel vapors (gas fumes). This is how this all started. To correctly fill the tank, put the gas handle all the way in the gas tank filler tube. And when it clicks, stop filling it. Thats the limit the tank can handle.
Now that the canister is probably full of gas, when that happens the charcoal in it (which stores the gas fumes) breaks apart and goes through the system, It clogs up the whole system with broken up pieces of charcoal.
This also clogs the Purge Valve most of the time and causes it to stay stuck open. Hopefully because of the design of this system, since it has an orifice tube, lets hope that the tube clogged up and caught anymore of the charcoal from going into the evap system.
Unfortunately this is a self inflicted issue due to the guy over filling the tank.
If all those codes come back in a day or 2, thats most likely the cause of the canister assembly failure.
This happens alot, its the main cause of canisters being filled with gas.
The first diagram shows the front of the canister, the 2nd shows the hoses coming to and from the canister. You can unhook these one at a time and see if any gasoline comes out of them. There shouldnt be any, only gas fumes,
the 3rd diagram is the Purge valve that is supposed to open and pull the gas vapors from the gas tank and canister. It shouldnt have any gasoline in it either.
Toyota has is located in 2 different locations, so if its not here, it will be under the hood near the intake manifold, if so we will deal with that last.
The 4th diagram is the wiring harness to the assembly. Each number (AK1, SK2, etc) are electrical connectors. So check the connectors for any corrosion inside them. Most likely you wont find any.
The 5th diagram is the Cut-Off valve, its the valve that closes once the tank is full and causes the gas handle to click at the gas station, due to vapor fill.
My worry is that there is gasoline being drawn threw the system all the way up to the Purge valve and then into the engine. And thats why your going through so much gas.
On your scan tool app push the Real Time Information and see if you can find anything that says Long Term Fuel Trim. Or anything to do with Fuel Trim and tell me what its reading while the vehicle is running.
Or I see it has CO2 emissions readout.
Images (Click to enlarge)
Sunday, June 5th, 2022 AT 1:49 PM