If you went back with the old float, there will be a 'water line' imprint where the gas has stained the metal. Get that parallel with the top when inverted and it will be real close.
If it's a new float then go by the specs, usually a measurement between the top of the float and the bottom of the cover gasket when inverted.
The float drop should be sufficient to let the needle valve open but not pull out so far that it can come out or cock, it's not a real critical adjustment.
Another test is to turn the top upside down, let the float rest on the needle, suck on the inlet fitting, put your tongue over the hole. It should hold vacuum.
Realize the incoming fuel must be clean! The slightest piece of trash will foul the needle valve. I like to do a final flush of the line before connecting, You can even let some gas flow as you make the connection if the area is dirty.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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