ChaDter 6 Emissions control svstems
6-5
Carbon element
Air cleaner /
Purge control valve
Fuel check valve
Charcoal
I
II #
~.............,........, :.:.:,.,I
-Fuel vapor
-- - Purge air
I/L
3.2a Evaporative emissions control system (1983 through 1989 US mqdels)
Air cleaner
/
Caguretor rrrm?,t,
Vapor-
liquid
separator
Carburetor
float chamber
Fuel filler cap
(Vacuum relic,‘)
\ \ #li I
I 1
6
Fuel pump’
Fuel strainer /
3.2b Evaporative emissions control system (1983 through 1986 Canadian models)
purging thevapors from the charcoal. This air/vapor mixture isthen routed 6 When the engine is not running, gasoline vapors produced in the fuel
to the engine combustion chambers (through the air cleaner) and burned.
tank (by an increase in atmospheric temperatures) are routed to the sepa-
4 The purge control valve is kept closed at idle speeds to prevent vapor-
rator tank in which liquid gasoline formed by condensation of the vapors is
ized fuel from entering the air cleaner and causing high-idle carbon mon- separated. The remaining fuel vapor is led into a two-way valve. The two-
oxide emissions. way pressure valve is designed to open at a predetermined pressure, ad-
5 The carburetor itself is vented internally or through the charcoal can- mitting the fuel vapors into the charcoal-filled canister, the vapors are
ister, depending on the temperature, which prevents the escape of gaso- trapped by the charcoal, preventing the discharge of raw hydrocarbons
line vapors into the atmosphere from the carburetor. into the atmosphere.
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