Subclass 3/045: Idling devices for carburettors (with means for facilitating idling below operational temperatures F02M 1/00) Preventing flow of idling fuel under conditions where engine is driven instead of driving, e.g. driven by vehicle running down hill Control of valves situated in the idling nozzle system, or the passage system, by electrical means or by a combination of electrical means with fluidic or mechanical means