Automobile fuel level indicator is an instrument used to indicate the level of fuel contained in a tank. Commonly used in most motor vehicles, these may also be used for any tank including underground storage tanks. As used in vehicles, the fuel level indicator consists of two parts:

• The sensing unit
• The indicator

The sensing unit usually uses a float connected to a potentiometer, typically printed ink design in a modern automobile. As the tank empties, the float drops and slides a moving contact along the resistor, increasing its resistance.In addition, when the resistance is at a certain point; it will also turn on a "low fuel" light on some vehicles.
The indicator unit is measuring and displaying the amount of electrical current flowing through the sending unit. When the tank level is high and maximum current is flowing, the needle points to "F" indicating a full tank. When the tank is empty and the least current is flowing, the needle points to "E" indicating an empty tank.

 

 

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