I hope some one can help me. I have a John Deere with 17 HP Kawasaki engine. The engine starts and runs fine. I noticed today a gas leak in front of the engine. Dug into it a bit and found about a 1/8 id tube coming from the top of the carburetor. The other end was open and gas was pouring out when the engine is running. It looks like the loose end is swelled out like it was plugged on to another pipe bit I can't find where. The tube is about 3 inches long and looks like an overflow. The engine model is FH500V-AS11. i WOULD GREATLY APPRECIATE ANY HELP.