YezusLX
SILVER Star
I wonder if it is used/required in conjunction with the air pump system later developed for emissions. Carbon does help mitigate fumes and helps to skirt cafe standards leveled by California. I believe the "Nader" Corvair was amongst the first to try adding carbon/charcoal in its system in an effort to avoid its ultimate demise by congress and the environmentalist back in the day.I’m not sure when they became commonplace but it’s a late model thing. My ‘07 has one.