[klayfish]

Thanks for the input guys. It's funny, I've gotten such a variety of answers, ranging from just clogging the filter to destroying the motor. Maybe one of these days, I'll convince my company to buy a junk car and try some experiments.
To give a few more details, this engine threw a connecting rod, and threw it hard. There is quite a hole in the side of the block, and the piston is nowhere to be found. It is claimed that nobody knew about the sugar until after the motor was replaced with a new one. When the shop tried to start the new motor, it started to run funny. They then pulled the fuel line and discovered the sugar.
I've asked many mechanics. Most say it is highly unlikely that sugar would cause this. I had one say that it is possibly, though very highly unlikely. He said that the sugar will burn and leave a black nasty carbon build up, IF it were to get past the filter and injectors. It will then build up over the valves and cylinder walls. Also the gases from the sugar burning aren't the same as gas, so it can lead to a vapor lock type situation. This combination can cause the engine to seize suddenly. But even he admits this is unusual, and would leave very tell tale signs.
Guess I have more work to do. Thanks again.

Steve