P0441 code

I have a 2005 Prius. Probably 350,000 miles on it or more. I had a misfiring code come up. I brought it to a mechanic to have the spark plugs changed out and he also cleaned the fuel injectors. While he was test driving it either before or after he said they ran out of gas. Told me my gas gauge wasn’t working. My gas gauge was working properly before I brought it to him. So now when I get it back, it won’t allow me to fill the tank. It’s fighting me to fill it up and once I do fill it up my gas gauge is staying full. Now it’s throwing a PO441 when I get to about 50 mph, every single day after I clear the code. I’m wondering if they left something disconnected that has to do with the gas tank not being able to release pressure. I also replaced the gas cap with a new oem one, no change.

 

No, I have not. I’ll go through the step by step process. Thanks for all the information