How Do Gas Pumps 'Know' Your Car's Tank Is Full?

If you drive a gas-powered car, you know the drill when it’s time to refuel: You pull up to the pump, pay, put the nozzle in your tank and pull the trigger to let the gas flow. When the tank is full, the pump shuts off automatically, and you’re on your way.

While pumping gas, you have plenty of time to wonder how the gas pump knows when the tank is full. You’d think there’d be an electronic sensor, but that’s not how it works.

It’s a mechanical system that relies on vapor pressure. The mechanism is somewhat fragile, and you can damage it by ignoring the signs warning you not to top off your tank.

As this post explains, you can also damage your car.

Selected excerpt(s) and linked article courtesy of Chris Deziel, familyhandyman(dot)com
Royalty-free photo courtesy of Pixabay

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