I have a Merc 9.8 that floods out and I cannot figure out why. The gas pours from the bronze tube at the front of the carb when the tank is connected and the engine running...it soon floods and dies. I have taken the carb apart - perfectly clean (stored dry every year). I have rebuilt with a new carb kit. The float appears to be working with no barrier to moving up and down. With carb off the engine, it seems the float does move up and down per design. Arghhh! Any help will sincerely be appreciated.