Hey guys! None of my trucks less my 89 has ever had a charchol canister on them. I'm just wondering what exactly they do? I've got my charchol line from the tank's sending unit just blocked off with a breather right now, but my TPI has all of the equipment needed to run it, and I'm wondering if I should just toss one on. I have no problems running emissions systems so long as they don't take a lot of my power away (like one of those useless smog pumps) and actually perform a useful function.