How Do Gas Pumps Know When to Stop?

If you've ever put gas in a car, you'll know that the pump magically knows when to stop spewing fuel into the tank. That's super useful, and safe too. But how does it know when to stop?

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Is it witchcraft? Psychic powers? Clever guesswork? Or, you know, some simple but incredibly smart engineering? Watch this video and find out! [YouTube]

DISCUSSION

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So is this complicated mechanism what I should blame for the gas dribbles on my car when I pull the nozzle out?