18. Emission Control System
18-2
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 from the 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 an activated carbon canister where the hydrocarbon in the vapor will be absorbed
by active carbon.
● When the engine is running, the negative pressure of the intake manifold opens the purge line,
release HC from the activated carbon and then sucks it into the engine together with air from the
bottom of the canister.
● The canister can be used repeatedly without reducing its performance because of the system's
purge function.
3.
Troubleshooting:
Fuel can not flow to the fuel injector
● No fuel in the fuel tank
● Malfunction of the fuel pump/ fuel pressure regulator
● Clogged fuel 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.
Active carbon
canister
Vacuum hose
Blow-by hose
Engine
Fuel tank cap (closed type)
Fuel tank
Vapor hose
Purge control valve
Air cleaner
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