Daihatsu F300 Service Manual page 1344

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EMISSION CONTROL SYSTEN
FUEL EVAPORATIVE EMISSION CONTROL SYSTEM
(GCC specifications only)
The fuel evaporative emission control system prevents the fu91 evaporative emission generated inside thE
fuel tank or the float chamber of the carburetor from being discharged to the atmosphere.
As
the temperature rises, the pressure of
the fuel evaporaf1ve emission generated in the fuel tank increase:
while the engine is stopped. When this pressure rise exceeds a certain level, the check valve at the positivE
pressure side is raised and the evaporative emission is absorbed into the activated carbon in a charcoa
canister.
When the engine starts running, the check valve at the negative pressure side opens so that any evaporativE
emission stored in the canister may be sent to the combustion chamber to be reburnt there.
On the other hand, the fuel evaporative emission generated in the float chamber of the carburetor is sen
into the charcoal canister when the BVSV exceeds the set temperature (65°C).
r
-I-
Carburetor float chamber
l-
Charcoal
canister
- Flow of purge air
- - - - - Flow of fuel vapor
Inspection of fuel vapor lines, fuel tank & filler cap
~
1. V1sual inspection of fuel vapor line and connections
Check the line and connections for loose connections, kinks
or damage.
2. Visual inspection of fuel tank
Check the fuel tank for deformation, cracks or fuel leakage.
3. Visual inspection of fuel filler cap
Check the cap and gasket for damage or deformation.
Replace the cap, if necessary .
EC-5
Fuel tank
Emission-pipe
Return-pipe
Main-pipe