To use the emergency fuel shut-off switch, simply push the button and hold it in place. This will stop the flow of fuel to the engine and cause it to stall. The switch can be turned off by pushing it again.
The emergency fuel shut-off switch is a safety feature that can be used in the event of an emergency. For example, if you are in a car accident and the fuel tank is ruptured, you can use the emergency fuel shut-off switch to stop the flow of fuel and prevent a fire.