Hey Guys and Gals,
After a long hiatus i had a wierd happening with my gs and i was thinking you guys could help. Theres a hose on the bottom on the engine (at least it sticks out there) which i believe is the engine vent hose. Its not the clear battery hose but the other black one near it.

Recently on a trip to tucson i had gas just pouring out of it. Pretty much my whole gas tank emptied from it and i was left with no gas. Does anyone know what the issue is? I changed some petcock hoses and i got back to san diego alright but then two days ago same issue.

When i saw it happening i was far from home and so i gunned the engine and started driving as fast as i could to come home and again the drip stopped after 30 seconds of the motor running. Its been fine since.

I'm pretty stumped. Any ideas

Your WHOLE tank?

Sounds like you left the petcock on "prime" and a float stuck, slowly draining the contents of your tank into the carbs, though the open needle.  Then out of the carbs and into the airbox, where it drained though the airbox drain hose.

If this happens again, try tapping the float bowls with a hammer, rock, etc. gently to dislodge the stuck needle.

Overhaul your carbs as soon as possible.  Very carefully inspect the float, needle, float pivot shaft, needle seat, and needle retainer for wear. 

Also check to see if your float has ruptured and has gas in it.  A boat with water in it won't float.  A float with gas in it won't float either. 

another possibility, which was what was wrong with my bike when I got it:

there's a drain tube in the tank that allows fuel overflow and rainwater to go through so it doesn't fill up the recessed area in the tank. My tube had a hole in it near the bottom, thus dumping all the fuel

If that's the problem, apparently you can buy a new tube for $10, but I didn't notice that until after I had fixed it, and wouldn't have the foggiest idea about how to actually replace it. What I did, was cram a soft copper tube (bought at hardware store) in there. It was a really tight fit, and I was able to get it far enough in there to plug up the leak, then kreem'd the tank to make sure.