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Which loss occurs while the tank is being filled?

  • A.The refuelling emission, as incoming liquid displaces the vapour that occupied the space above the fuel
  • B.Refuelling loss
  • C.Running loss, which occurs during the operation of the vehicle including the period when it is being refuelled
  • D.Hot soak loss

Answer: B

Incoming fuel displaces an equal volume of vapour. The last option explains exactly that mechanism, which makes it a correct and more instructive version of the same answer. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Tracing the requirement back to the physical constraint that produces it makes the answer follow.

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