Carburetor float wear
Most Model A carburetors encountered today have been subjected to considerable use. The most frequently overlooked side effect of that use is a small dimple worn into top of the float from the valve needle. The effect of this dimple is a lateral bind on the valve needle that prevents it from closing completely and sealing.
The brass float material is fairly soft and easy to blend out the ridges of the dimple by sanding from front to back by hand, then buffing. There are many alternatives, but choose your best method to carefully taper and blend the surface and the valve will operate smoothly and reliably.
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