Thats one way to do it. I blow into the fuel line and push the float up until it shuts off the air flow. When the float is about level with the carb body or a tad toward the top when the valve shuts off, thats where I set it. It's easier to see whats going on with float level with power jets though. If you wanted to see where the level is without taking the carb off, you can probably hook up a line to the drain valve on the bowl, then raise the end of the line up higher than the carb. The height in the line will be where it is in the bowl.