Fuel Evaporation Reduction System — Description (Mitsubishi Colt 4)

The main element of this system is a carbon filter located in the engine compartment.

At idle, when the engine is still cold, fuel vapors added to the balanced mixture cause excessive emissions of toxic substances through the exhaust pipe. Because of this, one of the chambers of the throttle body of the fuel injection system is used to direct fuel vapors to the filter only after the throttle valve is opened wider than the idle position. Without a vacuum, the filter purge valve will not open.

When the engine is cold, the flow of air and fuel is restricted by a thermal valve.

When the purge valve of the filter opens, air is sucked in under a slight vacuum from the air intake. If operational problems arise during engine warm-up, and all settings and adjustments of the main fuel system and engine are carried out correctly, the operation of the thermal valve should be checked.