Good morning, I'm looking for some suggestions.

I have a 2012 brute force 300. It has been about 2 years since it has been ridden. When I took it out riding recently it is leaking fuel out of the carburetor drain tube. This happens when the machine is off with the fuel valve on, as well as, when it running at idle and at low speed under light throttle. It doesn't appear to leak at higher speeds under moderate to heavier throttle positions. What might cause this problem ?
Any insight would be great!
Thanks