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A carbon canister in the evaporative system

  • A.Adsorbs fuel vapour and later purges it into the engine to be burnt
  • B.Filters particulate from the exhaust
  • C.Condenses fuel vapour back to liquid
  • D.Stores excess fuel for cold starting

Answer: A

Vapour is held on activated carbon while the engine is off and drawn into the intake once it is running warm. The purge must be scheduled carefully, since an uncontrolled purge upsets the fuelling and drives the mixture rich.

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