Automobile

How Does the Gas Pump ‘Know’ When Your Car’s Tank Is Full? | MotorBiscuit

If you have ever filled up your car’s gas tank, then you have probably heard the loud “thud” that occurs when the gas tank is full. That’s actually not your car telling you that the tank is full, rather, it’s the pump instead. But how does the pump know when the tank is full?

There’s some science involved when pumping gas into your car

A drop of gasoline clings to a gasoline pump nozzle at a filling station. Notice the hole at the tip of the pump. | (Photo Illustration by Sean Gallup/Getty Images)

RELATED: Can You Start a Fire With Your Cell Phone While Pumping Gas?

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