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6C-54
1977 PONTIAC SERVICE MANUAL
P U M P
LEVER
D I S C H P I R G E PPISSAGE
P U M P
B A L L R E T I I N E I
P L V N G E Y
S P R I N G
-
C U P
S
P U M P P L U N G E R
' -
t '
E X P I N D E U S P R I N G
Fig.
6 C - 9 9
M4MC Pump System
NOTE: PLUNGER
BUCKING SPRING
CHOKE
FRONT VACUUM
BREAK ADJUSTING
FOLLOWER
BALL
3067
THEP
COIL
CHOKE
CHOKE
VALVE
VACUUM BREAK
ROD
1
n
ADJYSTING SCREW
r
BAFFLE
b
VACUUM
-
UNLOADER
SECONDARY'
FAST'
>AST
TANG
LOCKOUT
IDLE
IDLE
LEVER
CAM
ADJUSTING
FOLLOWER
SCREW
471 1
Fig.
6 C - 1 0 1
Choke System M4MC X Series VI Code L
1. Remove air cleaner and gasket.
2. Disconnect fuel and vacuum lines from carburetor.
3. Disconnect accelerator linkage and electrical
connectors.
4. Remove carburetor attaching bolts and remove
carburetor and gasket.
Installation
Fill carburetor bowl before installing carburetor. This
reduces strain on starting motor and battery and reduces the
possibility of backfiring while attempting to start engine. A
small supply of no-lead fuel will enable carburetor to be filled
and the operation of float and inlet needle and seat to be
checked. Operate throttle lever several times and check
discharge from pump jets before installing carburetor.
1. Be certain throttle body and intake manifold sealing
surfaces are clean.
2. Install carburetor to manifold gasket.
4. Place carburetor in position and loosely install four
attaching bolts.
5. Install vacuum lines and loosely connect fuel line.
6. Tighten four attaching bolts to 145 in. lbs.
7. Tighten fuel inlet nut to 300 inch pounds.
8. Connect accelerator linkage and downshift controls
if so equipped.
9. Adjust idle speeds.
10. Install air cleaner.
Fuel Filter Replacement
A plugged fuel filter will restrict fuel flow into
carburetor and will result in a loss of engine power.
1. Disconnect fuel line connection at inlet fuel filter nut.
2. Remove inlet fuel filter nut from carburetor.
3. Remove filter and spring.
4. Install spring and filter element in carburetor with
hole in filter toward nut.
5. Install new gasket on inlet fitting nut and install nut
in carburetor and tighten securely.
6. Install fuel line and tighten connector.
Solenoid Replacement
The solenoid should be checked to assure that the
solenoid plunger extends when the solenoid is energized. An
inoperative solenoid should be replaced.
Removal
1. Remove carburetor air cleaner.
2. Disconnect electrical connector at solenoid.
3. Remove 2 bracket screws and remove solenoid and
bracket assembly.
Installation
1. Install solenoid and bracket assembly.
2. Connect electrical connector.
3. Install air cleaner.
4. Refer to vehicle emission control information label
and adjust idle speed.
UNIT OVERHAUL
GENERAL
The procedures below apply to the complete overhaul
with the carburetor removed from the engine.
However, in many cases service adjustments of
individual systems may be completed without removing the
carburetor from the engine. (Refer to "On-Car Service").
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