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GROUP
3
PUT ROD
IN
INSIDE HOLE
ACCELERATING PUMP LINK
ACCELERATING PUMP OPERATING ROD
B1424-C
FIG. 4
-Accelerating
Pump
Stroke
Adjustment
chined
surface
of
the
carburetor
main
body
to the
level
of
the
fuel in
the
fuel
bowl. The
measurement must
be
made
at
least
1/4
inch
from
any
vertical surface
to
assure an accurate
reading because
the
surface
of
the
fuel
is
concave
(higher
at
the
edges
than
in
the
center).
Care
must
be
exercised
to
measure
the
fuel level
at
the
point
of contact with
the
fuel.
Refer
to
the
specifications
for
the
correct
fuel level
(wet)
setting.
5. If
any
adjustment
is
required,
stop
the
engine
to
minimize
the
hazard
of
fire due
to
fuel
spray
when
the
float
setting
is disturbed.
To
adjust
the
fuel
level,
bend
the
float
tab
contacting
the
fuel
inlet
valve
upward,
in
relation
to
the
original
position,
to
raise
the
fuel
level
and
downward
to
lower it. Each
time
an
adjustment
is
made
to the
float
tab to
alter
the
fuel level
the
engine must
be
started
and permitted
to
idle for
at
least
three
(3)
minutes
to
stabilize
the
fuel level. Check
the
fuel level
after each adjustment
until
the
specified
level
is
achieved.
6.
Install
a
new
air
horn
gasket
and
the
carburetor
air
horn
assembly.
7. Check
the
engine
idle
speed and
idle fuel
mixture
and
adjust
as
re
quired.
8. Install
the
air cleaner assembly.
Accelerating Pump
Stroke. The
over-travel
lever has 4 holes
and
the
accelerating pump
link has 2 holes
to
control
the
accelerating
pump
stroke
for different
engine
applica
tions
(Fig.
4).
For
average
ambient
temperature
operation
(40
to
80F),
place
the
accelerator
pump operating
rod
in
the
No. 2 hole
position
of
the
over-
travel
lever
(second
hole from
the
throttle
shaft).
To
release
the
rod
from
the
retainer
clip,
press
the tab
end
of
the
clip
toward
the
rod,
and
at
the
same
time
press
the
rod
away
from
the clip
until
it is dis
engaged.
For
low
ambient
temperature
oper
ation
(below
40F),
place
the
pump
operating
rod
in
the
No. 3 hole
posi
tion
of
the
over-travel
lever
(third
hole from
the throttle
shaft).
For extremely low
ambient
tem
perature
operation
(
15F
and
be
low),
the
pump operating
rod
may
be
placed
in
the
No. 4 hole
position
to
suit
individual operating
condi
tions.
For
high
ambient
temperature
operation
(above 80F
and/or above
5000 feet
altitude),
the
pump
oper
ating
rod
may be
placed
in
the
No.
1
hole
position
of
the
over-travel
lever
(hole
closest
to
the
throttle
shaft)
to
suit
individual
operating
conditions.
The
correct position
for
the
pump
operating
rod at
the
accelerator
pump
plunger
lever,
for
all
operating
con
ditions,
is in
the
inboard
hole (hole
closest
to
the
pump
plunger).
HOLLEY
DUAL CARBURETORS
IN-CHASSIS ADJUSTMENTS
Idle Fuel Mixture Adjustment
1. Operate
the
engine
until
it
reaches
normal
operating
tempera
ture.
If
the
car
is
equipped with an
air
conditioner, the
engine must
be
operated
at
least 20
minutes.
All
engine speed
and
idle fuel
mixture
adjustments
must
be
made
with
the
air
cleaner
installed.
2. Establish
an
initial idle fuel
mix
ture
adjustment
by
turning
both
idle
mixture
screws
on
each
carburetor
(Fig.
5)
inward
until
they
are
lightly
seated.
Then
turn the
idle
mixture
screws
on
each
secondary
carbure
tor
(Fig.
6)
outward
3/4
turns,
and
turn the
primary
carburetor
idle
mix
ture
screws outward one
full
turn.
3. Install
an engine speed
tachom
eter.
Start
the engine;
move
the trans
mission selector
lever
to the
DRIVE
(Dl)
position,
and
set
the
parking
brake. Adjust
the
engine
idle
rpm
to
575-600
rpm
by
turning
the
idle
speed
adjusting
screw
(Fig.
5)
on
the
primary
carburetor only.
4.
Turn
the
primary
carburetor
idle
mixture screws
inward
until
the
engine
begins
to
run rough
from
the
lean
mixture.
Turn
the
mixture
screws
outward until
the
engine be-
I
I
SECONDARY
THROTTLE LEVER
DLE MIXTURE
SCREW
WIDE-OPEN THROTTLE STOP
SECONDARY
THROTTLE ROD
PRIMARY
THROTTLE
LEVER
PRIMARY
THROTTLE ROD
IDLE SPEED
ADJUSTING SCREW
B1718-A
FIG. 5-390
6-V
Carburetor Throttle Linkage Installation
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