Abstract: An automatic choke for a carburetor comprises a fuel enrichment valve (59, 60) for controlling the flow of fuel into a carburetor, a first operating lever (54) movable by a temperature sensitive element, e.g. a bimetallic coil spring, into engagement with an end stop (100); a second operating lever (57) for opening and closing the fuel enrichment valve (59, 60); a resilient connection, e.g. a coaxial coil spring (64), between the first and second levers (54, 57) by which the first lever moves the second lever to open the fuel enrichment valve at low temperatures; and an override lever (72) operable by a vacuum control device (73-80) to move the second lever against the bias of the resilient connection to close the fuel enrichment valve at low temperatures and low engine loads.