Make sure when you re-install the carb float bowl, it is in the proper orientation(position). There are two ways it can go on, one is 180deg out and incorrect. The key is the drain on the exterior bottom of the float bowl should be pointing to the RIGHT. This is the correct position. Take a look at it and you will see what I mean. This is a very simple thing, but critical! (and not mentioned in the manual!)
Getting to the carb is talked about alot in these forums. Once you do it a few times using the recommended methods, you will see that it truly is no big deal.