Motorcycle Repair: petrol leaking out of air filter housing, kawasaki zephyr, filter drain

Question
dear anthony
i have a ZR750 kawasaki (zephyr, 1991). after stopping the bike it flooded as i tried to start it. i clutch started it and got home. then during the night all of the fuel leaked out  (12 litres!) i took the tanlk off, and it appears that the tap won't turn off. - ie it keeps runnning out in all positions. the fuel has gone into the air filter housing and come out the air filter drain hose. shouldl i just replace the tap and clean the air filter, or would fuel have gotten into the engine? the bike was running well up untilo then - ie the carbs seemed fine...
there is some rust i can hear in the tank, is there any way of getting that out, or fixing that problem as well?

any help would be appreciated!

thanks
sarah

Answer
Sarah,

You will definately need a new petcock but the rust in the tank signals the entire area may be rusted... rust is a cancer and must be erradicated or it will continue to do damage..  

Personally, I would replace the gas tank as well, if not do not clean it with anything else but gasoline.

good luck
Anthony