1976 charcoal canister hose routing to carter 0- 2543 carburetor

what is the function of the this float bowl valve from the canister??
@pjogger I was under the assumption that that line vented vapor FROM the carb TO the canister... So I think what Dan is saying is jacking it into the air cleaner would be attempting to "flow" it backwards... But since there's all that black magic going on inside the canister it essentially would do nothing... So *I think* capping it off is the path forward...
Of course I may stand to be corrected... I'm learning right along side ya!