If it's leaking from the fitting that screws into the carb, there should be a copper or brass compression washer in between the carb and the large fitting, so you may need a new one,,or tighten more..
The other fitting is an adapter, if it's a flare seat type, it could be damaged, need to replace or tighten.
if it's Pipe thread, just tighten, sometimes a wrap w/teflon tape helps..
I've had to resort to using thread sealer before on the threads into the bowl. Also make sure your wrench is not hitting the bowl bolt head on the bottom making you think its tight when it is not. BTDT!