Gravely 424 - Page 8

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./,,,.DIAPHRAGl'l
I4OUNTING
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DIAPHRAGI,I SPRING/E
PUI'IP
MTCH
l,tARK
ligure
3-Fuel
Pump
FUEI PU'YIP
The fuel pump
Iever rides on the
cam and
transmits
this
mechanical action to a diaphragm
within the
pump
body.
Beonditioning
Procedure:
1.
Remove fuel
lines
and mountiag screws hold-
ing
pump
to engine.
2.
With
a ffle,
make an
indicating mark
ecross a
point
at the union of
fuel
pump
body
and
cover.
This is
a
positive
marking
to
assure
proper
reassembly.
Remove assembly screws
and
remove
cover.
3. Turn cover and remove
valve
plate
serew and
washer. Remove
valve
retainer, valves, valve
springs and
valve
gasket,
noting their
position.
Discard
valve
springs,
valves
and valve
retainer
gasket.
4. Clean fuel head
thoroughly
with solvent
and
a ffne wire brush.
Holding
pump
aover
with diaphragm
surface up,
place
new
valve
gasket
into
the
cavity. Now aseemble the
valve
spring and valves
into the caity
and reassemble
valve
retainer and lock
in
position
by inserting and
tighteniag fuel
pump
valve
retainer screw.
Place
pump
cover
assembly
in a clean
place
and
rebuild
the
lower
diaphragm
section.
Holding
mouating
bracket,
press
down
on the diaphragm to
compress
spring
under it, then
turn braclcet
90o to
unhook diaphragm
so
it
can
be
removed.
Clean mounting
bracket
with a solvent
and a
ffne
wire brush.
ieplace
the
diaphragm operating
spring,
stand new spring in
casting,
position
diaphragm and
press
doWn
on
diaphragm
to
compress spring
and turn
90o to reconnect
diaphragm.
Hold
mounting bracket,
then
place
the
pump
cover on it
(make
sure that in&cating
marks are in line) and
insert the
four screws.
DO
NOT
TIGHTEN. With the hand
on the mounting bracket
only,
push
the
pump
Iever
to
&e limit
of its
travel and hold in this
position
while tightening
the four
screws.
This is important
to
prevent
stretching
the &aphragm.
Mount &e fuel pump
on
engine, using
the new mounting
gaskets.
Connect the
fuel
Iires.
6.
t.
8.
9.
10.
l"l.
7