So, basically the charcoal canister would absorb the venting vapors created by expanding gas (eg. when engine is shut off and it’s hot) and then purge itself when the truck was running.
Just so I am clear, if I was install the charcoal canister in my ‘52 3100, I would have to tee into my existing vent line, install a hose with a high loop over the fill tube that goes to a charcoal canister installed outside the cab and install a sealed cap to force the escaping vapors thru the canister.
