Gas Smell + Venting/Filtering Options: Charcoal Canister?

[steve aleve]

I have completed a 5.3 Vortec LS swap and have a potent gas smell that is present when the truck is parked in the garage. I have installed a tank and an LS line kit from Tanks Inc that has a vent line to a rollover valve. I am planning on using a non-vented gas cap because of this, but was wondering if anyone has added a charcoal canister to their system (without tying it into the CPU?) If so, does this help? Are their other considerations or dangers to doing this? Thanks in advance! Steve