Chevrolet 10 Series 1968, Service Manual, Page: 417 / 713

ENGINE FUEL 6M-24
F ig . 3P—Installing 307, 327, V -8 Fuel Pump
from body under diaphragm at rocker arm side.
7. Unhook vacuum diaphragm pull rod from vacuum
link. This can best be done by extending vacuum
diaphragm and tilting towards rocker arm while roll­
ing pull rod off link (fig. 4P).
8. Remove pump from vise, invert pump so fuel side is
up, and reinstall rocker arm in vise. Have pump
body flush with jaw of vise.
9. Use a 3/8” or slightly larger drill or a file to re­
move portion of rocker arm pin which is upset over
pin washer.
10. Drive out rocker arm pin using a long tapered drift.
11. Remove rocker arm, rocker arm spring, spacer
washers, fuel and vacuum links, link spacer and
rocker arm bushing from pump.
12. Remove fuel diaphragm.
13. Remove metal around diaphragm pull rod seals,
which was displaced by staking, with chisel, small
round file or small grinding wheel. Pull seals out of
body with hook shaped tool, using care not to damage
seal seats.
14. Remove all valves in fuel and vacuum covers in the
same manner.
C leaning and Inspection
1. Clean and rinse all metal parts in solvent. Blow out
all passages with air hose.
2. Inspect pump body, fuel cover, and vacuum cover for
cracks, breakage and distorted flanges. Examine all
screw holes for stripped or crossed threads. If any
of these three parts are damaged or if pressed in
vacuum pipes in vacuum cover are bent or loose the
pump should be replaced.
3. Inspect rocker arm for wear or scoring at camshaft
pad, at point of contact with links and at pivot hole.
Inspect bushing for wear.
Assem bly
1. Install seals by placing seal and retainer in pull rod
recess of pump body with rubber end down toward
links and press down firm ly with flat end of 7/8”
diameter round bar.
2. Stake die cast lip in four places to retain seals.
3. Assemble link spacer over fuel link.
4. Place one vacuum link on each side of fuel link. The
hook ends of vacuum link should come together so
that they surround fuel link. All link hooks should
point in same direction.
5. Place assembly of links and spacer between lobes of
rocker arm with one spacer washer on outer side of
each vacuum link.
6. Slide rocker arm bushing through hole in rocker
arm, spacer washers, links and link spacer. Place
thick washer over both ends of bushing. (See Figure
5P for correct placement of all parts in rocker arm
and link assembly.)
7. Set fuel pump on bench with mounting flange up.
8. Install rocker arm spring into body placing one end
over cone-like projection in pump body.
9. Holding washers onto rocker arm bushing, slide the
rocker arm and link assembly into pump body (fig.
6P). Projection on link spacer should fit into end of
rocker arm spring and open end of link hooks must
point toward vacuum flange.
10. Drive new rocker arm pin through bushing and install
ROCKER
ARM
ROCKER ARM
BUSHING
FUEL
LINK
WASHER
VACUUM
LINKS
LINK
SPACER
CHEVROLET TRUCK SERVICE MANUAL