I've gotten all 3 of these codes previously when my CEL light came on, PO440/441/446....but after checking my gas cap, I just cleared the codes.....that is until this time when the light came on again and I started smelling heavy gas fumes.

Aside from the gas cap, does anyone know what this could be that would also cause a heavy gas fume smell?

any info. is greatly appreciated,

Thanks in advance

 

The codes are related to the EVAP system. The system could have a damaged hose, broken fitting or the EVAP canister cracked. The result can be gas fumes.