14. Emission Control System
14-2
Fuel Evaporative Emission Control System (E.E.C.)
1. Construction:
y Reduce HC to pollute air.
y To absorber fuel vapor and saving fuel consumption
2.
Principle of operation
● Vapor generated in fuel tank and fuel system through evaporation is contained in the confined
system to prevent it from escaping into the atmosphere, at the same time, the vapor will be
introduced into a charcoal canister where the hydrocarbon in the vapor will be absorbed by active
carbon.
● When engine is running, the negative pressure of intake opens the purge line, breaks HC off from
active carbon and then sucks it into engine together with air from bottom of the canister.
● The canister can be used repeatedly without reducing its performance because of the system's
purge function.
3.
Trouble Diagnosis:
Fuel can not flow to carburetor
● No fuel in the fuel tank
● loosen vacuum hose of the fuel pump
● plugged hose in the system
4. Cautions:
● Do not exceed the reed valve of the fuel filler when filling out fuel.
● Do not have rush acceleration or running in high speed when applying the spare fuel.
Automatic control
fuel cup
Active carbon
canister
Vacuum hose
Flesh air inlet
Carburetor
Blow-by hose
Flesh air
Fuel
Fuel vapor
Vacuum
Engine
Fuel vapor separator
Fuel tank cap (closed type)
Fuel tank
Fuel hose
Vapor hose
Vapor purge
control solenoid
Air cleaner
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