diaphragm
out
pushing fuel through the pump output
reed valve into
the
output chamber and into
the
fuel
line.
Servicing
the
Pulsating Diaphragm Fuel Pump
1.
Remove vacuum
and
fuel lines. Inspect lines
for
wearrcracking,
etc.
2.
Scribe
two
lines
(one
each
on
opposite ends
of
pump) across pump parts. This will insure correct
alignment
of
pump parts with each other
and
carburetor when pump
is
reassembled.
3. Remove fuel pump attaching screws.
4.
Holding pump carefully, pull sectionsof thepump
apart. The diaphragm, plunger, return spring
and
plate,
pump body and gaskets will
now be
loose.
5. Check parts
for
wear and damage. Replace with
new parts where necessary.
6.
The
pump
air
bleed hole
in
pump base must
be
unclogged
to
allow unrestricted movement
of
pump diaphragm.
CAUTION
DN
i
A clogged diaphragm air bleed hole can
cause diaphragm wear and seal damage
while inhibiting pump operation.
7. Replace gaskets and reassemble pump as shown
in Figure
17.
8. Install pump and replace lines. Makesure fuel line
clamps
are
replaced
on
fuel line.
T WARNING I Use care when reassembling the pump.
'
•••'•fl All parts must be perfectly aligned or the
pump will leak creating a fire hazard.
THERMO-MAGNETIC
CHOKE
(Optional)
This choke uses
a
strip heating element and
a
heat
sensitive bimetal spring
to
control
the
choke plate
position.
In
addition
to
this,
a
solenoid
is
actuated
during engine cranking, closing
the
choke
all or
part
way, depending on ambient temperature. The bimetal
is factory
set to
position
the
choke
to the
proper
opening under
any
ambient condition.
Choke Adjustment:
If
adjustment
of the
bimetal
is
needed,
it
must
be
made
at
ambient temperature.
Do
not attempt adjustments until engine
has
been shut
down
for at
least
one
hour. Loosen
the
screw which
secures the choke body assembly. Refer to Figure 18.
LOOSEN THIS
SCREW
AND
ROTATE
THE
ENTIRE COVER
ASSEMBLY
FIGURE
18.
THERMO-MAGNETIC CHOKE
SPRING,CHOKE
—,
LEVER,LIMIT
-,
WASHER
(17/64
I.D.X5/8
O.D.X1/16")
WASHER, INSULAT
RING,RETAINING
PLATE,
CHOKE
MOUNTING
BODY,CHOKE
PLATE,
CHOKE COVER
/ ^-ARMATURE ASSY.
COIL,SOLENOID
FRAME,SOLENOID
(Rv WASHER,SHAKEPROOF
WASHER (24/64
I.D.X9/16
O.D.X1/16")
LEAD,GROUND
FIGURE
19.
CHOKE ASSEMBLY
20
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