Hi, i have just had the same thing on my mower, you have to remove the carb to get the bowl off on the Empress 16, it was the rubber on the inside of the bowl(on the other side to the spring) i just cut the lot off and braised it up, No more leak, It is only to empty the bowl of mucky fuel and to store empty. Problem solved, or so i thought, I now have the problem of putting the left over spring back in place, I have no idea where i took it off? so don't make the same mistake.
Good luck,
Dizzy jim
August 2010