After I filled up a few weeks ago I got home and realized that my bike was leaking fuel from the breather hose that comes off from the gas tank. I have NO idea why or how this is happening. It's a 2001 zx6r. Please help with any answers. Thank you!

 

did you overflow the tank? where that vent hose is? hmm, after a few weeks of riding that should not be an issue then.

More info please and welcome to KF

 

Odd issue indeed, how much riding did you do in in the weeks since you filled up? if you just brought it home and let it sit the temperature change could cause the tank to overflow, but its unlikely. Your sure its coming from the tank vent and not the airbox?