It will clog the filter causing unfiltered gas (with sugar) to bypass the filter (in most cases), The contaminated gas then enters the injectors causing them to stick & leak the sugar fuel into the intake runners. This sticky mess sticks to everything: valves, pistons, cylinder walls, etc.... It acts as sand paper on these pieces, causing valves to leak, valve guides to stick, and compression rings to be damaged. If you keep running it like this, it will begin to smoke, and miss due to sticking valves and ring damage. The fuel pump wil also be destroyed, obviously. There may even be camshaft problems in some cases, from the sticking valves.
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