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While having the float level set to spec is a good idea, it's not as critical (within a 16TH of an inch or so) as some people think! Being off a little WILL NOT cause the carb to run over. Start by verifying that the inlet valve seat is tightened TIGHT into the upper carburetor body, and a GOOD gasket is in place so no gas can get into the carburetor by leaking around the inlet valve seat's threads. The fact you have trouble getting gas into the carburetor at times sounds like the float, or even the inlet needle itself, is jamming or binding. Examine the inlet valve needle for any "burrs" or roughness that could cause it to jamb in the bore of the seat, and not close tightly. Verify the float is not leaky and "gas logged". Then, set the float level to spec. Eyeball that the float pontoons are not bent, and that they are centered in the float bowl. Look for any evidence of contact between the float and the float bowl... if the tractor has been run a while, vibration will cause shiney wear spots any place on the float where it touches the float bowl. Bend the float, as needed, to eliminate any contact or binding. Many of us tractor nuts agree, though, it is always a good idea to shut off the gas when the tractor is parked for the day. Even a carb in the best of shape may, out of the blue, "run over", if a flake of crud gets in the needle and seat area.
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