I have found fuel leaking out of the tube that is connected to the bottom of the float bowl on my 400. There is a check valve in the tube that is installed so liquid can run from the bowl, but not into the carb.. The down stream end of the tube is not connected to anything! I suspect this tube is a bowl overflow line, but don't know for sure if it should be connected somewhere. Please let me know if the downstream end should be connected to something and where it should connect.... If it does not normally connect to anything... Why is there fuel running from it??