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FLOAT SYSTEM
There
IS
only
one
float
chamber
while
two
l
arburetor systems
primary
Jnd
st
l
ondary
are
provided
Fuel
fed from
the
fuel pump flows
through
the
filler
and needle
valve
into
the
flo
t
chamber
A
constant
fuel
level
is
maintained
by
the
float
and
needle valve
Because
of the
inner air vent
type
of the float chamber ventilation
the
fuel
consumption
will
not
be
in
fluenced
by
some
dirt accumulated
in
the air
deaner
The needle valve includes
special
hard steel
ball
and will
not wear
for all
its
considerably
long
use
Besides
the
inserrion
of
a
spring
wiU prevent the
flooding
at
rough
road
running
BOOST
CONTROLLED
DECELERATION
DEVICE
B C D D
A
Boost Controlled Deceleration
Device
B
C
D
D
serves to
reduce the
hydrocarbons
He
emitted from
en
gine during coasting
The
high
manifold
vacuum
during
coasting
prevents
the
mixture
from
complete
combustion because of
the
reduced
amount
of
mixture
per
cyl
inder
per rotation
of
engine
with the
result
that
a
large
amount
of
hydrocar
bons
is
emitted
into
tile
atmosphere
The
B
C D D has been
designed
to
correct
this
problem
It
opern tes
as
follows
when
the
manifold
vacuum
exceeds
a
pre
Engine
Fuel
determined value
the
B C
D D
intro
duces
an
additional
mixture
of
opti
mum
mixture ratio and
quantity
into
the manifold
by opening
a
separate
mixture
passage
in
the
carburetor
Complete
combustion
of fuel
is assist
ed
by
this additional
mixture
and the
amount
of
H C
contained in
exhaust
gases
is
dramatically
reduced
During
the
transition
period
from
coasting
to
idling
the transmission
produces
a
signal
which
turns
on
the
vacuum
control solenoid valve
As
this
takes
place
the valve
is
lifted off
its
seat
opening
the
vacuum
chamber
to
the
atmosphere
The
mixture
control
valve
is
then
closed
returning
the
engine
to
the
predetermined idling
speed
On
manual
transmission
models
this system
consists
of
B
C
D D
vacuo
urn
control solenoid valve
speed
de
tecting
switch
and
amplifier
On
automatic transmission
models
it consists
of B C D
D
vacuum con
trol
solenoid
valve
and
inhibitor
switch
BC D D
operation
Diaphragm
I
Qj
monitors the mani
fold
vacuum
and
when
the
vacuum
exceeds
a
pre f e t e r m i n e d
value
acts so
as
to open the
vacuum
control valve
@
This
causes
the manifold
vacuurn
to
be
introduced
into
the
second
vacuum
chamber
and
actuates
dia
phragm
ll@
When
diaphrngm
II operates
the
mixture control valve
@
opens
the
passage and introduces the additional
mixture
into
the manifold
EF
18
The
amount
of the mixture is
con
trolled
by
the
servo
action
of
the
mixture control
valve
CID
and
vacuum
control
valve
@
so
that the manifold
vacuum
may
be
kept
at
the
pre
determined value
The
amount
of
mixture
depends
mainly
upon
the
coasting
air
bleed
II@
while
the mixture ratio is
deter
mined
by
the
coasting jet
@
and
coasting
air
bleed
@
See
Figure
EF 31
Vacuum control solenoid
valve
operation
Manual transmission
models
The
vacuum
control solenoid valve
is
con
troDed
by
a
speed
detecting
switch that
is
actuated
by
the
speed
ometer
needle
As the vehicle
speed
falls below 10
MPH
this
switch
is
activated
pro
ducing
a
signal
This
signal
actuates
the
amplifier
to
open
the
vacuum
control
solenoid
valve
Automatic
transmission models
When
the
shift lever
is in
N
or
P
position
the
inhibitor
switch
mounted
on
the
transmission turns
on
to
open the
vacuum
control solenoid
valve
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