[Rich72C10]

gee, wished I had a idea. but perhaps you just have residual? Or perhaps since you are not venting into a canister, maybe its is getting back into the truck from your vent hose? Its not like these trucks are perfectly sealed from the outside. The vapor coming from the hose is pretty intense (concentrated).

Before I replaced my canister the smell was really bad (when opened it had nothing in it!!). Seeing how the vapors came into the house, I would guess you got to be getting some into the cab. Granted my truck being closed up in a garage didn't allow the smell to dissipate....