Early Fuel Evaporation ( EFE ): Description and Operation

Fig. 43 Mixture heating system. (Typical):

This system incorporates a positive temperature coefficient heater, installed between the carburetor and intake manifold, to reduce emissions and improve driveability during engine warm up. When the engine is started, this heater is electrically energized and heats the air/fuel mixture that passes through it. When the engine is warm the water temperature switch cuts off current to the heater.