Suburban 1/2 Ton 2WD V8-350 5.7L (1986)
Early Fuel Evaporation ( EFE ): Description and Operation
System Description
The EFE system provides a means of rapidly heating the induction system during cold engine operation. Rapid heating improves fuel vaporization,
which in turn improves mixture distribution and reduces the length of time that carburetor choking is required. Two types of EFE systems are used, the
vacuum servo type and the electrically heated type
