Evaporative Emission Control System Function - KYMCO MOVIE 125 Manual

18
. EVAPORATIVE EMISSION CONTROL
SYSTEM

EVAPORATIVE EMISSION CONTROL SYSTEM FUNCTION

FOREWORD:
The Evaporative Emission Control System is abbreviated to E.E.C. System. This device collects
the fuel vapor from the carburetor and fuel tank and then the fuel vapor is drawn into the engine for
re-burning to avoid air pollution caused by the fuel vapor diffused into the air.
FUNCTION
Item
Purge Control Valve
Charcoal Canister
P.C.V.
TROUBLESHOOTING
Engine loses power or runs erratic at idle speed
1. Clogged P.C.V. system
2. Clogged air cleaner
3. Faulty purge control valve
4. Loose or broken E.E.C. system tubes or connectors
Engine idles or accelerates roughly
1. Faulty fuel cut-off valve
2. Faulty purge control valve
3. Clogged or faulty charcoal canister
Purpose
Control vaporized HC from
fuel tank not to diffuse into
the air.
Absorb and store the
vaporized HC from the fuel
tank and carburetor.
Completely recover the HC
of blow-by gas in the
crankcase for re-burning.
Function
The charcoal canister absorbs vaporized HC
from the fuel tank. When the engine is
running and the purge control valve is open,
the fuel vapor in the charcoal canister is
drawn into the engine for re-burning.
The vaporized HC is absorbed in the
charcoal canister and the specified volume of
HC in the emission should not exceed 2g.
Through the P.C.V. system, the blow-by
gas from the crankcase is separated into fuel
vapor and fuel and then drawn into the
cylinder for re-burning.
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