Can is too thick and I only used 1 candle.
Vehicle is unbalanced that leads the car couldn't move.
The candle was too close to the can result in fire goes out.
I put too much water in, and the heat from two candles isn't enough to make the water boiled.
Make some changes:
Front-end of the can of the steam-boiler
Changes the 2 candles into thermogel
Modified finished product
The pressure in the tank is not enough.
My car was burned because the fire was much more intense and vigorous when it was lit with thermogel, and the frame of the car fell apart because the hot glue melted.