TL/DR - Been chasing the dreaded EVAP codes P0440 & P0446 and curious to know if its a stuck purge valve and where the location of that valve would be in the engine bay.

For detail...
Originally appeared as a P0440 and jumped to a triple P0440/0441/0446. Had a purge valve near the charcoal canister and pipe leading to it replaced, got rid of the P0441 code. Now dealing with the last two. I recently had the check engine light go off, but come back on.

However, I've been going to a Tires Plus near my house to help me with these issues, but that will be ending since I've been going to them for the EVAP codes, but coming out with a P0325 knock sensor replacement, went and got that fixed only to come out with a P0115, Water Temp Sensor, because the shop had hit the sensor installing the intake manifold while fixing knock sensor. So when I took it to a friends house to have the water temp sensor replaced, we found the shop had left extra nuts and a stray hose laying across the engine. (Also the shop stole all my plastic clips for the covers!! )
Generally all around I wish the EVAP codes could be more specific because this is a goose chase I wish I hadn't chased.

Temp sensor repair pit crew. Also note me (Blue puff jacket / red shoes) holding the hood up since one of the struts blew.

 

The evap system is a closed system that checks the pressure of itself so if you have a leak the system will not be able to build up pressure and will throw a code. There is a vent valve and purge valve one is in the engine bay the other is near the charcoal canister which is located near the gas tank and is a ***** to get to and involves removing axles and such.
I will post a picture of were the one valve is in the engine bay it's possible if someone did work in the engine bay that they accidentally unhooked it when they put that plastic cover on or took it over. That is what happened to me when I installed my headers.

 

See the area I circled in red check out there that's were it was unplugged after the header install super easy to miss.