Chevrolet 30 Series 1967 Service Manual page 337

General Description..........................................................6M-13
Service P ro c e d u re s ......................................................... 6M-13
Fuel Pump Inspection and T e s t ................................. 6M-13
Vacuum Section Inspection and T e s t ........................... 6M-14
Removal ............................................................... 6M-14
The fuel pumps used on both six and eight cylinder en­
gines are of the diaphragm type. Two types of diaphragm
fuel pumps are used, a servicable combination fuel and
vacuum pump and a non-servicable fuel pump that be­
cause of design, is serviced as an assembly only.
The pumps are actuated by an eccentric located on the
engine camshaft. On in-line engines, the eccentric actu­
ates the pump rocker arm. On V
(located between the camshaft eccentric and fuel pump)
actuates the rocker arm.
INLET
Fig. I P - Fuel Pump (N o n -Serviceab le)
FUEL PUMP INSPECTION AND TEST
The fuel pump should be checked to make sure the
mounting bolts and inlet and outlet connections are tight.
Always test pump while it is mounted on the engine and be
FUEL PUMPS
INDEX
Page
GENERAL DESCRIPTION
engines, a push rod
- 8
OUTLET
SERVICE PROCEDURES
Installation . ............................................................ 6M-14
Disassembly ......................................................... 6M-14
Cleaning and In sp ectio n .......................................... 6M-15
A ssem b ly .................................................................. 6M-15
Fig. 2P - Step-Van Fuel and Vacuum Pump
1. O u tlet V a lv e
10. Pulsator Diaphragm
2. Fuel Cover 11. Fuel Inlet V a lv e Assembly
3. Fuel Diaphragm 12. Pump Body
4. Fuel Diaphragm Spring 13. Rocker Arm Return Spring
5. Vacuum Link 14.
6. Fuel Link
15.
7. Vacuum O u tlet V a lv e 16.
Assemblies 17. Vacuum Diaphragm
8. Diaphragm Spring 18. Vacuum Inlet V a lv e Assemblies
9. Pulsator Cover 19. Vacuum Cover
sure there is gasoline in the tank.
The line from the tank to the pump is the suction side
of the system and the line from the pump to the carbure­
tor is the pressure side of the system. A leak on the
pressure side, therefore, would be made apparent by
ENGINE FUEL 6M-13
Page
Seal
Rocker Arm
Bushing
CHEVROLET TRUCK SERVICE MANUAL