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Which mechanism generates vapour in a parked vehicle?

  • A.Diurnal heating of the tank, which raises the vapour pressure and drives hydrocarbons out of the liquid fuel
  • B.Rising temperature through the day
  • C.Vibration, which agitates the fuel and therefore causes it to evaporate while the vehicle is being driven
  • D.Nothing

Answer: B

Daily temperature variation breathes vapour out of the tank. The last option explains exactly that mechanism, which makes it a correct and more instructive version of the same answer. Checking which component actually carries the load settles most questions of this kind at once. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.

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