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The floats sticking in the open position in the fuel reservoir. Possible, but this linkage almost never distorts. Another possibility is a pinhole in the float, especially if the float is hollow soldered metal. Most likely is a worn out needle valve and/or seat. These are included in most carb rebuild kits. After replacing, check the float height against the specs, usually also included with kit.

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Q: What would be the cause of the carburetor filling up with fuel and coming out of all overflows?
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