3'erd on checking that float, needle /seat. Bad enricheners can cause extreme rich conditions but not totally fill or flood the carb. The float /needle/seat is the only mechanism in the system that controls that type of fuel flow.
most likely you've picked up some trash somewhere, deteriorated fuel lines, filter failure, needle tip, the stock plastic tank. The gas we get these days, ethanol? eats the old rubber stuff up.
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