I make my own charcoal cannisters out of billet aluminum, however on a VW I made one really simple and easy out of PVC pipe, I used 2" PVC with a glued on cap on 1 end, tapped for a screw in hose barb on 1 end, the other end I fastened on and I drilled a series of 1/8" holes. I then took a (nylon pantyhose swiped from the wife) and then went to the aquarium supplies at the local Walmart and bought activated charcoal and filled the panty hose, tied it in a knot and slid it in the pvc tube, capped it attached the vent hose from the tank (make a loop in it higher than the tank) and you will never smell gas again, cost about 5-10 bucks unless its billet. Best of Luck Matt