John - I have the choke cable disconnected so it is completely open. I've visually verified as well.
ndutton - I've tried to do this but by the time I get the fuel shut off and the carb unbolted it's full. Don't know if it's from the time it takes me to do that, or if it's staying full. I've tried 2 different carbs, and today a straight gravity feed fuel system with a new fuel pump and hoses. Getting the same result.