Lots of history on this issue on the Studebaker forum. Its a fault of modern gas. Also, the float level needs to be higher than factory in many cars to work reasonably better with ethanolized fuels, and having a 6 volt "primer" pump on a switch sure helps (hint, put it on a starter button sort of arrangement, and hide it under the edge of the dash) Then, after periods longer than a day or two, press the button to prime the carb, then try starting. Also helps with vapour lock in hot weather. Again, the problem is due to greater volatility in modern fuels making a bad problem worse. Yes, it reduces pollution, but since most cars that the new fuels have parts suited to it, and have fuel injection, it is only a problem with older cars with carbs.