Toyota TERCEL 1985 Repair Manual page 101

EMISSION CONTROL SYSTEMS — Fuel Evaporative Emission Control (EVAP) System
FUEL EVAPORATIVE EMISSION CONTROL (EVAP) SYSTEM
To reduce HC emission, evaporated fuel from the fuel tank is routed through the charcoal canister to the carburetor
for combustión in the cylinders.
Condition
(1)
Parking, idling
CLOSED
and low speed
Médium and
OPEN
high speed
High pressure
—
in tank
High vacuum
—
in tank
Check Valve
(Vacuum Valve)
(Canadá Wagón M/T & 3A Engine)
Charcoal
Canister
Canister Check Valve
(2) (3)
—
—
— —
OPEN CLOSED
CLOSED OPEN
INSPECTION OF FUEL VAPOR LINES,
FUEL TANK AND FUEL FILLER CAP
1. VISUALLY INSPECT LINES AND CONNECTIONS
Look for loóse connections, sharp bends or damage.
2. VISUALLY INSPECT FUEL TANK
Look for deformation, cracks of fuel leakage.
3. VISUALLY INSPECT FUEL FILLER CAP
Look for a damaged or deformed gasket and cap.
If necessary, repair or replace the cap.
íasket
EC1102
Fuel Filler Cap
Fuel Tank
Check Valve
Check Valve in
Evaporated Fuel (HC)
Fuel Filler Cap
HC from tank is absorbed
—
in the canister.
HC from canister is led
—
into carburetor.
HC from tank is absorbed
CLOSED
in the canister.
OPEN (Air is led into the tank.)
EC-13