Hope this helps someone. 2008 5.3 here. So after replacing canister, both solenoids purge valves and dropping the tank to blow out the lines I still had the CEL. I started checking fuses under the hood and noticed a square fuse/relay missing its top clear cover. #72 “left bussed electrical center 2”. I replaced it and CEL shut off. If someone could please confirm this fuse/relay linked to the EVAP system would be appreciated. Thanks.