Brian I can not recommend strongly enough that before you attempt to start the RPU again that you drain and change the oil and filter. By now you probably have a crankcase full of gas.......2 worst case seneiros that I have personally seen th results of are a crankcase explosion (severe enough to literally blow the valve covers off a SB Mopar) and/or wiped bearing.

Yes it can siphon and dribble out the venturies once the level gets high enough (the vent tube is higher so you won;t see it come out of there).

One cure that I have used in the past if the tank is higher than the carb is to run an electric inline fuel valve. Once power is supplied (key in the on position/start position) the valve opens. With the key off it defaults to the closed position.