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Sounds to me like the fuel is evaporating out of the float bowl after a long sit-possibly the line from the fuel pump to the carb as well. Also might want to check that fuel pump as well-sitting for long periods would not do the diaphragm in the pump well. The pump can be easily checked with a low cost pressure tester. Should be at least 3-1/2 pounds pressure as I recall-and it should hold-not fall. If it does replace the pump. By the way, if you replace it and the pump rods keeps falling, put some grease or Vaseline on it to keep it in place while you are bolting the pump in place.
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