1) Remove spark plug and clean it, put it back
2) Try to start as normal
3) Remove spark plug, if it is wet and smell gas. The fuel line is ok.
If it is not, the fuel line is clogged. The gas tank should be empty when last time you used the snow blower or fuel stabilizer should be added. You may buy some fuel line cleaner or called inject cleaner to wash it open. If this don’t work. Bring it to a shop.
4) If the spark plug is wet. Clean it and touch it against engine block. Ask someone try to start it. You check if there is any spark. If there is no spark, replace with a new spark plug try again. If there is still no spark. Bring it to shop.
5) If there is gas and there is spark. The snow blower should start.