My Hummingbird Feeder Leaks, It's Glass Ball With Tube Hanging Below That Has Curved Neck Up. Liquid Runs Out. Why And How Do I Stop Leaking?

There should be a small BB or ball in the tube to help prevent leaking.

If it is made of glass, use a torch - either mapp gas,the yellow can, or the green one, and heat up the tubing at the bend until red hot, and with a pair of pliers, carefully and quickly increase the angle. This will slow the drip. Make sure to wear safety glasses!
Anytime the wind blows, or anything that makes the bird feeder unbalanced, it will drip. It is the nature of the beast, you know, gravity and all that.
Hope this helps.

Well first make sure that there isn't a crack anywhere on the glass bulb. If it is leaking through the bottom of the tube where the hummingbirds feed, then that means either the feeder is not level on the place where it is hanging, or that the wind is blowing it and causing it to leak out. If none of this is the reason, I would get a new hummingbird feeder!  :)