Chevrolet 10 Series 1968, Service Manual, Page: 418 / 713

ENGINE FUEL 6M-25
F ig . 6P - Installing Rocker Arm and Lin k Assembly
flat washer on small end. Peen over end of pin to
retain in position.
11. Install gaskets and vacuum valves in vacuum cover.
After pressing down to accomplished seal against
gasket, stake valves in position.
NOTE:
Do not install inlet valve in pump body
until diaphragm is installed.
12. Install inlet screen, gasket and retainer in fuel cover
inlet passage.
F ig . 7 P - Installing Fuel Diaphragm
F ig . 8P - Hooking Vacuum Pull Rod to Vacuum Link
13. Install gaskets and fuel valves in fuel cover. Stake
valves into position.
14. Soak fuel diaphragm in clean kerosene. Fuel oil may
be used, but do not use shellac or sealing compound.
15. Set fuel diaphragm on bench with pull rod pointing up.
Assemble retainer and diaphragm spring over fuel
diaphragm pull rod.
16. Pick up pump body, with vacuum flange up, in one
hand, and the fuel diaphragm assembly in the other.
Position end of diaphragm spring into well of fuel
side of pump body.
17. With vacuum side of pump still up, shake fuel link
into position to engage with pull rod.
18. Position diaphragm in palm of hand so that flat of
pull rod is parallel with fuel link (fig. 7P). Push
pull rod through oil seal against spring tension.
Turn diaphragm 90° so that pull rod "ro lls " onto
link. This motion should engage hook end of link
with "eye" of pull rod. If not, repeat this operation
until connection is made.
CA U TIO N :
Extreme care must be used when
inserting diaphragm push rod through seal to
prevent damage to seal.
19. Install fuel cover on body making sure that scratch
marks on cover and body line up. Push on rocker
arm until diaphragm is flat across body flange.
Install cover screws and lockwashers loosely until
screws just engage lockwashers. Push rocker arm
through its full stroke and hold in that position while
tightening cover screws securely.
NOTE: Diaphragm must be flexed before tight­
ening cover screws to insure proper clearances
and pump stroke.
20. Place pulsator diaphragm on pump body. Install
pulsator cover with bolt and lockwasher.
21. Place rocker arm in vise with vacuum flange of pump
up.
22. With one hand push pump down against spring tension
so it travels through half a stroke and hold. With the
CHEVROLET TRUCK SERVICE MANUAL