If it is the common type with a float (big empty bulb) on the end of a rod, rotate the rod or bend it to make the float sit igher. The water will have to come higher in the tank to raise the rod high enough to shut of the water.
You can try bending the rod to the float slightly up or down.
You can try bending the rod to the float slightly up or down.
The pool water level will correspond roughly to the centerline of the float. So raising the float height raises the water level and vice versa. The float and its short rod connect to the float valve with a small 'wing' nut or screw. Using a small pair of pliers, carefully loosen this screw a bit until the float/rod pivots freely up and down on the valve assembly. Reposition it where you would like it, and retighten the screw. (No need to overtighten--just snug so the float is fixed to the valve portion.) It may take a couple of days for the level to adjust; then go back and readjust the float if needed. I would not 'bend the rod', as some have suggested, as the rod on this type of float is usually very short and doing so will likely break off the float or damage the valve.
When the float sinks completely pull the rod out of the water sharply. The FISH ON message should play. Hold the rod there for as long as it takes.
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There are many different kinds. -The most common are a 'float switch' which turns off as it rises, and a 'float rod' which is similar. They are not valves, they turnoff the electricity.
The carburetor will have to be taken apart to install a new fuel float. After the top is off, the float sits in the bowl resting on a rod. Pick it straight up, remove the needle and install it on the new float. Put the carburetor back together with new gaskets.
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There is a set screw at the valve end of the float rod, but these are usually corroded so that you cannot adjust them. Most people just bend the rod up or down as needed. Hold the rod at the base so that you do not damage or break the fill valve or the rod.
There is a screw on the top of the fill valve, but these are usually corroded. Most people just bend the rod holding the float to adjust the water level.
A rock, for one, although pumice will float. Any object whose desnsity is greater than water's will sink.