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I thought the sugar in the car's fuel tank was a myth. Yet it's there on page 13-14 (PDF pg. 10-11)

And I never ever heard of using sugar to compress a sponge in order to clog the drain.

It is a myth, mythbusters tested it. You can put a lot of sugar in a fuel tank, it won't make the car not run.

polystyrene foam on the other hand might do the trick

Absolutely. Gasoline gells.