[Don Quixote]

I built an evap system out of an old external oil filter system. Both tanks vent into one line which leads to the down tube which goes straight to the bottom of the canister into a bed of steel wool. Using a toilet paper roll in the middle where the tube sits, I filled around it with activated charcoal with another layer of steel wool on the top and put the cap back on. I installed a tee on the outlet and capped it with a small breather element. I ran the other portion of the tee to the breather hole on the valve cover. This system is much like Chryler's early system and I could make it more elaborate to seal it to open at a certain engine temp, &c., but I was mostly concerned about containing some or most of the fumes and using an unvented gas cap that won't spill whenever I turn right.