Discussion
Evaporative emissions from a petrol vehicle arise principally from
Answer: D
Correct answer: Fuel vapour escaping from the tank and fuel system
Evaporative emissions are hydrocarbons that never pass through the engine at all - petrol vapour escaping from the tank, the fuel lines and the injectors, driven off by ambient warmth and by the day's temperature cycle.
They are controlled by a carbon canister that adsorbs the vapour while the vehicle is parked and releases it to be burnt when the engine runs. The exhaust, crankcase and catalyst are all sources of emissions, but of combustion products rather than raw fuel vapour.
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