Daihatsu 1997 Terios J100 Service Manual page 195

FUEL EVAPORATIVE EMISSION CONTROL SYSTEM
The fuel evaporative emission control system employs a charcoal canister type. The charcoal canister type
leads the fuel vapor into the charcoal canister which uses activated carbon to absorb HC emission. The ab-
sorbed HC emission is drawn into the throttle body to be burnt together with mixture in the combustion
chamber.
Purging line
Check valve 1
Check valve 2
Pressure condition
Engine condition
in tank
Engine is running
at idle condition
High pressure in
tank
Vehicle is running
Low vacuum Engine is running
pressure in tank at idle condition
High vacuum Engine is running
pressure in tank at idle condition
Inspection of fuel vapor lines, fuel tank & filler cap
1. Visual inspection of fuel vapor lines and connections for loose connections, kinks or damage
If any damage is present, repair or replace the parts, as required.
2. Visual inspection of fuel tank
Check the fuel tank for deformation, cracks or fuel leakage.
If any damage is present, repair or replace the part, as required.
Replace the fuel tank cap, if any deformation is caused by the negative pressure in the fuel tank.
Check valve 3
Canister check valve Check
valve in
safety
1 2 3
filler cap
Closed Open Closed Closed
Open Open Closed Closed
Closed Closed Open Closed
Closed Closed Open Open
Purge port
Combustion chamber
Throttle body
Fuel tank vapor line
Check valve
Fuel tank
Fuel Evaporative emission (HC)
HC emission is absorbed by the charcoal
canister.
HC emission is sucked into the engine
through the charcoal canister.
HC emission absorbed by the charcoal
canister is returned to the tank.
If the vacuum pressure rises, even after the
check valve of charcoal canister has
opened, the safety valve in the fuel filler
cap will open to prevent damage to fuel
tank
EC–5
JEC00007-00006
JEC00008-00000
JEC00009-00000