Even if it may seem negligible to have some evaporative emissions control on a Diesel vehicle, it's always good to prevent water contamination which may lead to algae and bacteria growth while sitting idle for a relatively long time.
Quote:
Originally Posted by JSH
Motorcycles have particularly bad evaporative emissions - even new ones.
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It used to be a more critical issue, but nowadays most resort to a charcoal canister just like cars have been doing for a long time.