EVAPORATIVE EMISSION CONTROL SYSTEM
An evaporative emission control system is used to prevent emission of fuel vapors from the vehicle fuel
system.
The system allows evaporating fuel vapors to be stored, when the engine is not running.
This is accomplished by venting the fuel tank and carburetor float chamber through a vapor storage
canister containing activated charcoal.
The major system components are vapor storage canister, vent solenoid, and liquid vapor separator.
The fuel vapor from the fuel tank is led into the canister and stored there when the engine is not running.
The fuel vapor from the carburetor float chamber is also stored in the canister when the ignition switch is
“OFF”.
When engine runs, the fuel vapor stored in the canister is drawn into the carburetor together with fresh
air.
For vent solenoid valve operation, refer to item of “BOWL VENTILATION SYSTEM.”
2
1
Fuel vapor flow
+llal
Fresh air flow
1. Intake manifold
2. Vapor storage canister
3. Liquid vapor separator
4. Fuel tank
5. Carburetor
6. Vent solenoid valve
Fig.
5-
l-5 Evaporative emission con trot sys tern
5-7
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