What is a Fuel Level Sensor?

The fuel level sensor helps you monitor the fuel level inside your vehicle's gas tank.

It is usually located in the fuel tank or attached to the fuel pump carrier bracket. It is composed of three parts: the float, actuating rod, and resistor.

As used in vehicles, the gauge consists of two parts: 
The sending unit - in the tank
The indicator - on the dashboard

See more:
https://www.rico-instrument.com/faq/is-your-fuel-gauge-telling-the-truth.html
https://www.rico-instrument.com/faq/what-is-the-working-principle-of-the-reed-liquid-level-sensor.html


Example:
Level gauges

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