could be a stuck float valve, loose or damaged drain screw or damaged/missing drain screw O-ring. I have seen steel drain screws with badly corroded tips, which can cause leaks. That nipple is where gas comes out when the drain screw is opened.
Try tapping on the float bowl (bottom of carb) with a screwdriver handle and see if that fixes it. If not, remove the drain screw (in the upper right of blue circle), take a pic and post it. Be sure to turn the petcock to the off position first. Turning the petcock off every time you park the bike is a good habit to develop.
Try tapping on the float bowl (bottom of carb) with a screwdriver handle and see if that fixes it. If not, remove the drain screw (in the upper right of blue circle), take a pic and post it. Be sure to turn the petcock to the off position first. Turning the petcock off every time you park the bike is a good habit to develop.