EVAPORATION CONTROL SYSTEM
LIQUID/VAPOR
SEPARATOR
OPERATION:
All General Motors passenger cars
and light trucks are equipped with an Evaporation
Control
System.
This system
is
designed
to
minimize
the escape of fuel vapors to the atmosphere. Included
in the system are a special fuel tank, liquid-vapor
separator, carbon canister, canister purge hoses, and
carburetor modifications. Fuel vapors which would
otherwise escape to the atmosphere are directed into
the carbon canister. The carbon adsorbs the vapors
and stores them. The vapor
is
removed from the
46
canister during periods of engine operation
as
mani-
fold vacuum draws the vapors into the engine and
burns them.
NOTE:
Th.
G.n.r.'
Motora
E".por.tlon
Control
Sy.t.m
I. de-
.'gn.d
to
control ."aporatlon
10
••••
trom
your
c.r
und.r
normal
condition. u.'ng 9
lb.
R.ld
Vapor
Pr
•••
ur.
tu.'
.p.cltl.d
by
F.d.r.'
.nd
C.lltorn/a t
••
t r.qulr.m.nt •. How.".r, It
'Iou
.hould
u..
tu.'
ot .bnorm.lly
high
"o/.tlllty
tor
.x/.tlnll t.mperatur.
condition.,
you
may
d.t.ct
• ga.olln. odor
during
or att.r
dr/,,·
Ing
In
h
••
"y tr.mc.
It
'Iou
find
thl. obJ.ctlonabl.,
you
may
pr.t.r
to
u
••
• low.r "o/atlllty tu.'.
MAINTENANCE: For proper system perform-
ance, periodic canister tllter servicing
II
re-
quired. Every
12
months or
12,000
miles, which-
ever comes first (more often under dusty con-
ditions) the filter
In
the base of the can
liter
should
be
replaced
and
the canister Inspected.
NOTE:
Should It
.".r
b.
n.c
••••
ry
to
r.pl.c.
the
tu.'
tank cap,
u
••
only
the .peclfl.d c.p.
NOTE: For your convenience, all of the recom-
mended services for air pollution control systems
previously discussed are summarized
by
time and
mileage intervals in the Maintenance Schedule of
this manual.
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