Believe it or not the clip on the float ,the long end has to be facing the air filter side of the carburetor. I also learned this the hard way. I do not know why it makes a difference on the way it is facing but it does . It also states the same thing in a Tecumseh manual that i have.
Why is there a Philips screw in the carburetor. There should be a long bolt that goes through the Air filter housing to the hole in the middle of the carburetor .