IF you think your tank has sugar in it, do NOT start the car.
Drain the gas, flush the tank and fuel lines with CLEAN gas, and replace fuel filters.
IF you have started it, then you will ALSO need to flush the carburetor, and possibly have the heads pulled. Best to take it to mechanic BY TOW, NOT by driving.
The sugar will gum up the lines, clog the fuel filter, and IF it gets into the engine may cause valve and ring problems and/or severe carbon buildup in the cylinders which can require EXPENSIVE engine work sometimes to repair.