Re: I'm stumped on code p0446 please help
OK, not a bad idea, but the items you list are all FUEL systems items except for the charcoal canister, which is EVAP system part.
This is an EVAP code not a fuel system code. My suspects would be the canister or EVAP hoses/lines. Of course, I did fuel pump and filter/regulator a few years ago as my pump was seeping gas every so slightly.
Our cars are aging aging and all fuel and cooling hoses probably should be changed anyway. Many urge looking at brake lines at this time as well.