This video illustrates how a gas pump always stops before overfilling the tank

The clip explains the engineering behind the gas pump.
Loukia Papadopoulos

YouTuber Steve Mould always brings us educational videos that explain the oddest and most unique scientific concepts you are bound to encounter. You may remember this episode where he showed how ice can make water boil or this clip where he demonstrated how a self-healing polymer works.

In this latest edition of his show, he brings us an explanation of how gas pumps work. The question he answers is: how do these things know when to turn themselves off?

It is a very valid question indeed. Anyone who has ever put gas in their vehicle has never had to fear that their car might overflow with gas. The pump automatically and consistently turns off just when the gas tank is full.

Is this magic, or is there a built-in device that allows for this process to take place? Obviously, it’s the latter, and Mould explains exactly how this system work using a fake gas pump and some water.

The explanation must be seen to be understood and luckily it does not disappoint. The video explains through illustrations how a gas pump always manages to stop the flow of fuel just in time to avoid overfilling.

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