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A capacitive fuel quantity system measures

  • A.Fuel volume by a float position
  • B.Fuel flow to the engine
  • C.Fuel temperature only
  • D.Fuel mass, by change in capacitance

Answer: D

Fuel has a higher permittivity than air, so the probe capacitance rises as the tank fills. Adding a densitometer lets the system report mass, which is what actually determines the energy available. Volume alone would not.

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