I think Oldschool hit on something. Carbed engines could flood because of the drivers rather than the fuel systems.
A properly functioning carburated engine could be flooded out because they ran rich anyway and repeated pumping of the gas pedal could empty the float bowl into the intake flooding the engine. A properly operating fuel injected car is not subject to the same driver error. They run lean to begin with and you can pump the pedal until your foot falls off without pumping excess gas into the instream.