vapor lock???????

What it sounds like is fuel perculation, it happens when the motor is off and the carb and line heat soak, it is very common on alot of cars. We just can't see it happen usually because most cars don't have clear filters. It can perculate the fuel until it is all evaporated. But if your fuel pump is in good shape it should refill the carb in sort order and restart. It may crank for a bit but it should restart within 5 to 10 seconds. If it doesn't then it would be a weak fuel pump or an ignition problem.

Chuck