The tube off the bottom of the carb is the overflow tube. Sounds like the fuel is coming from there?
If so then it sounds like you have a stuck float. What that's for is when/if your float gets stuck it doesn't just flow all that fuel into the engine when the bowl is full. If that is what is going on, the best way to take care of it is to take the carb off and pull the bottom off of it (four screws) and then wash the inside down good with carb cleaner. DO NOT GET IT ON THE RUBBER GASKET! If you do it will swell and you can't reuse it.
MODS: Delete this, I didn't notice the original post date until after I replied. I made it to this site from a GOOGLE search and this is what popped up. Sorry.
Last edited by broughy84; 08-12-2012 at 07:09 AM.
Reason: Automerged Doublepost