Whether the floats are stuck open or not, Fuel should not reach the carbs with the petcock off, or no vacuum to the carbs.
True, but if the petcock is leaking, fuel will get to the carbs.
even if the fuel were to flow constantly, the float bowls will over flow if the fuel has no where to go...??????? If the fuel is still flowing to the carbs, the floats will shut the fuel off. That is what they are there for. To let fuel in when it is needed, and to shut the fuel off when the float bowls are full. So therefore they will NOT overflow.
what happens when you leave a facet on and have a cup to catch the water.. the cup overflows. Not the same concept. Water in a sink will overflow the cup because the water is getting past the faucet. There is nothing there to stop the flow. Gas in a tank won't get past the floats in a carb because they will shut off the flow of gas.
.. put in a float to shut close off the hose, but once the pressure between the hose and the cup equalize, water will flow again.. same concept.. True, same concept, fuel will flow once the demand is there for more fuel. Once the demand is gone, the fuel will shut off.