Final answer:
In an electronic-type fuel quantity indicating system, the tank sensing unit, also known as a 'sender,' uses changes in resistance to measure the amount of fuel present in the tank, which is then displayed on the car's fuel gauge.
Step-by-step explanation:
In an electronic-type fuel quantity indicating system, the tank sensing unit is commonly referred to as a 'sender' or 'sending unit'. This unit is connected to a voltmeter in the car's dashboard. As the amount of fuel in the tank changes, the resistance in the sending unit changes. This resistance change is translated into a change in voltage, which is then displayed on the fuel gauge.
For instance, referencing figures 10.34 and 21.29, the fuel gauges in a 1996 Volkswagen are voltmeters that register the voltage output of the sending units. These units are then, hopefully, proportional to the amount of gasoline in the tank, which gives an indication of the fuel quantity. In conclusion, the fuel tank 'sensing unit' or 'sender' provides data about the present fuel level in the tank by detecting changes in resistance due to the fuel quantity and transmitting this information as voltage to the gauge.
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