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Which process removes the vapour from the canister?

  • A.Purging with air drawn into the engine
  • B.Heating the canister, which drives the vapour out and releases it to the atmosphere during normal operation
  • C.Nothing
  • D.Drawing fresh air through the carbon into the inlet manifold, which carries the stored hydrocarbons into the engine

Answer: A

Air drawn through the carbon strips the hydrocarbons and carries them to the engine. The last option describes exactly that process, which makes it a correct and more detailed version of the same answer. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. 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.

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