Does sugar really seize an car engine?

It seems that sugar in a gas tank has no effect whatsoever on a car engine. This myth was tested in Episode 15, "Scuba Diver, Car Capers" on the show Mythbusters (Discovery channel, Wed @9pm), along with other engine myths such as destroying an engine by adding bleach to the gas tank. http://dsc.discovery.com/fansites/mythbusters/episode/00to49/episode-07.html