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How does a gas pump know when to turn itself off? [1]

['Gareth Branwyn']

Date: 2022-09-17

If you've ever wondered how a gas pump nozzle knows when to shut off when your tank is full, this video reveals the clever design.

Venturi tubes, Bernoulli principles, negative pressure — it turns out the design is far more complicated that you might expect. I always assumed it was some sort of an electronic sensor, but it's purely mechanical.

Image: Screengrab from video, Steve Mould.

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[1] Url: https://boingboing.net/2022/09/17/how-does-a-gas-pump-know-when-to-turn-itself-off.html

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