How Does The Gas Pump Automatically Shut Off When The Tank Is ...

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The Venturi effect is the physical phenomenon that causes the gas pump to automatically shut off when the tank is full. The Venturi effect occurs when the density of a fluid (in this case, gasoline) is greater than the density of the air. When the level of gasoline reaches the level of the hole in the gas pump nozzle, the Venturi tube experiences a change in fluid pressure. As a result, the diaphragm collapses slightly and an automatic shut-off of the flow of gasoline through point A occurs.

The extent to which various different devices and techniques have made our lives simpler sometimes baffles me. Almost everything has either already become, or is in the process of becoming, completely automated. Take, for example, the gas pump. Although it is mainly used to feed oil into the parched tanks of vehicles, there are quite a few imaginative ways that people use gas pumps; take this lady here, for example, who chooses to wash the windscreen of her car with it.

However, we’re not going to talk about other uses for gas pumps. We simply want to discuss an extremely common phenomenon that you probably observe every time you fill up the tank of your car. Yes, you guessed it… we’re going to figure out a bit more about the automatic shut-off function of the gas pump nozzle.

Automatically shutting off of the pump may seem like an “out-of-your-league” electric process, but actually, it’s not an electric process at all. In fact, it is a mechanical process – and a rather innovative one at that! It involves a very interesting physical phenomenon, known as the Venturi effect. Let’s take a closer look.

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