Originally Posted by SouthernGypsy
For what you described with no canister and if you intend not to use your EGR then;
A) Needs to be capped, it's not a vacuum leak if uncapped but will allow dust, crud, and moisture into your carb.
I question how the carb is suppose to vent the vapors, if you cap the outside vent off?
From my understanding, without that vent, vapors will enter the carb bore and create difficult hot-starts. Perhaps Mike can confirm.
Without a canister, I think I'd attach a short section of hose with a vent cap, similar to a transmission or diff vent.