Fuel flow cut-off by introducing air, e.g. brake air, into the idling fuel system

Full Title

Idling devices for carburettors (with means for facilitating engine's idling below operational temperatures F02M1/00) > Preventing flow of idling fuel > under conditions where engine is driven instead of driving, e.g. driven by vehicle running down hill > Fuel flow cut-off by introducing air, e.g. brake air, into the idling fuel system