fh}
}
3]
|
3}
Fuel Evaporation Control
|
4
The sealed
Volkswagen
fuel
evaporation
system
prevents
\
|
_
|
gasoline vapors
from escaping
to
the atmosphere
through
the
el!
————=
|
following
controls:
Qu
=
fo
|
Fuel tank venting
\
1
|
An
expansion
chamber
for the fuel tank
and
vent
lines
are
part
-
of the fuel tank vent system.
These
components prevent fuel
__
i
from escaping to the outside
at
extreme
high
outside tempera-
(—
.
é
tures
and when the
car
is
driven
or
parked
at
an
incline
or
in
|
~
:
any other non-level
position.
ICA
—=—,
5
Activated charcoal filter
5
(/
\\
(~
J
|
i
)
|
5
\
|
Vapors from the fuel tank
are
trapped
in
a
container filled
with
VY)
|.
activated charcoal. The filter is connected
to
the fuel tank vent
)
system. This is
how
tt
works:
|
*
_
23-503)
Fuel vapors pass
through the
filter and
deposit hydrocarbons
on
the surface of the charcoal filter element. When
the
engine
=
+
__
Eye
tank
5
—
Activated charcoal
filter
is
running,
fresh
air entering
the
activated
charcoal
filter
9o_
Expansion chamber
6—Ventline
through
an
opening
cleans
the
filter
and
routes
these
hydro-
—g_
Separator
7—WVent
line
carbons via the air cleaner back
to
the engine where
ihey
are
4—Vent line
8~
Air
cleaner
burned during
normal
combustion.
9—Fan housing
74
How
fuel
evaporation
control
works is shown in the illustration.
