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Where the float is connected in a float-type fuel tank?

  • A

    To the fuel flow indicator.

  • B

    To the variable resistor.

  • C

    To the mechanical linkage direct to the fuel indicator.

  • D

    To the variable capacitor.

Refer to figure.
The float-type fuel quantity measurement system is the most basic fuel quantity measurement system. It measures the fuel volume within tanks.

On top of the fuel level inside the tank, there is a float on top of it. This float is attached to the side of the fuel tank with a rotatable arm that is connected to a variable resistor that modulates the resistance of the fuel gauge's electrical circuit. The electrical circuitry of the float-type system typically uses DC current. As fuel is consumed in flight, the fuel level in the tank gradually decreases, which moves the float.

Moving the float vertically down will move the connecting arm, which will manually change the resistance value of the variable resistor - which in turn will change the indication on the gauge in the cockpit.

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