FUEL TANK GUAGE/SENDER:
The fuel sending unit located in the gas tank to measure the fuel tank level.Those follow three components work together to measure the vehicle's fuel level and relay the information to the Gas/Fuel gauge.
Float - The float, which is made of a buoyant composite or foam, floats on top of the fuel in the tank.
Metal rod or arm - The float is connected by a thin metal rod to a contact inside the variable resistor. 
Variable resistor -  A resistor is an electrical device that resists the flow of electricity, and a variable resistor has the ability to adjust the amount of resistance voltage encounters by sliding a contact (wiper) over a resistive element. The wiper is connected to the fuel gauge either directly by wire, or indirectly to an electronic device that communicates with the fuel gauge. In a fuel sending unit, the variable resistor receives power via a small coil from the vehicle's battery, which is used as the baseline signal.

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