How does the petrol nozzle know when to shut off?

Mumbai: When you get fuel filled in your car at a petrol pump, you are just supposed to feed in the amount of fuel you want to buy and the fuel nozzle fills up the tank accordingly, and it shuts automatically when the desired amount is filled. Ever wondered how that happens? The reason is surprisingly complicated and technical.

The video of the day explains how the gas nozzle knows when to stop filling your tank. Watch and learn: