I bought a D C not running. I put a 12 volts alternator on it, then thought I would rebuild the carb. Got a kit and cleaned carb, got kit installed and put back on tractor. Now when I turn gas on it floods tractor and run out bottom of carb. Took off 4 or 5 times to try to fix, but no change. Then I took it apart again and put old needle and seat back in (didn't leak before I took it apart first time). Guess what, now old needle and seat are leaking ( won't shut gas off). Took apart again and bent float down and still does not shut gas off. Anybody have any ideas what to try next. Thanks for any help you can give me.