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Which consequence follows from filling that space with fuel?

  • A.Expansion driving liquid fuel into the vapour lines and the canister, which floods and ruins the carbon
  • B.Fuel is forced into the vapour system as it warms
  • C.Nothing, since the fuel simply occupies the space and is consumed during the journey that follows the refuelling
  • D.Only weight

Answer: B

Warm fuel expands and has nowhere to go but the vapour line. The last option explains exactly that consequence, which makes it a correct and more instructive version. Overfilling is a common cause of canister failure. The shared behaviour explains why these belong together and the differences explain why both exist. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Most errors here come from carrying across a result from a neighbouring case where it does not hold.

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