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6C-66
1977 PONTIAC SERVICE MANUAL
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Fig.
6C-123 Installing
Pump Lever
the lever will face outward (Fig. 6C-107).
Make sure that the flats on the end of the choke shaft
align with flats in the choke lever.
7. The front and rear vacuum break units, fast idle cam
(choke rod), and inside thermostatic choke coil lever must be
adjusted properly before installing the choke thermostatic
coil and cover assembly and gasket. Refer to the Adjustment
Procedures.
8. After the vacuum break, fast idle cam (choke rod),
and inside thermostatic coil lever are adjusted, the
thermostatic coil and cover, and gasket should be installed
and the cover assembly rotated counterclockwise toward the
closed choke valve position. Align scribe mark on cover with
the specified notch on housing (See Automatic Choke Coil
Adjustment). Install three cover retainers and screws and
tighten securely.
9. If solenoid was removed, install solenoid and bracket
assembly with two screws to float bowl. Tighten securely.
10. After making vacuum break settings, connect the
front and rear vacuum break hoses.
screw. Tighten securely. When properly installed, the lever
will point to the rear of the carburetor and the number on
FUEL SUPPLY
CONTENTS
GENERAL DESCRIPTION
Fuel Filter
............................................................
6C-66
Fuel Pump
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Electric ............................................
6C-66
Fuel Pump
-
Mechanical
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6C-67
Fuel Tank and Lines
.......................................
6C-67
Evaporative Emissions Control
............................
6C-67
GENERAL DESCRIPTION
Fuel Filter
All engine fuel filters are located in the carburetor fuel
inlet. These fuel filter elements are of pleated paper. Elements
are placed in the inlet hole with the gasket surface outward.
A spring holds the element outward, sealing it by
compressing a gasket surface against the inlet fitting. If the
filter should ever become plugged, the engine will stop. An
engine stoppage caused by a plugged filter element will be
preceeded by a hesitation or sluggish operation.
Fuel Pump
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Electric
The pump operates under the following two conditions:
1. Ignition in START position, no oil pressure.
2. Ignition in R U N position, oil pressure (engine
running).
The two position oil pressure switch controls pump
operation. With no oil pressure, during cranking, current
from the starter solenoid PURPLE wire feed, goes through
the oil pressure switch, to the D K BLUE wire to the cowl
connector, then through the PINK wire to the ELECTRIC
FUEL fuse in the fuse panel to the D K BLUE wire to the
ON-CAR SERVICE
Fuel Filter
.............................................................
6C-67
Fuel Pump
-
Electric
...........................................
6C-68
Fuel Pump
-
Mechanical
.....................................
6C-68
..........................................
Fuel Tank and Lines
6C-68
.............................
Evaporative Emission Control
6C-69
fuel pump. Once the engine starts, and there is oil pressure,
the oil pressure switch directs current from the PINK wire
(from the ignition switch) to the D K BLUE wire, through
the fuse, and to the pump.
T H E TEMP PRESS lamp lights under the following
conditions:
1. No oil pressure, ignition in RUN.
2. Engine overheated, ignition in RUN.
The TEMP PRESS lamp receives its feed through the
PINK wire from the GAUGES fuse at the fuse panel. The
ground side is completed through the following two possible
paths:
1. Through the D K BLUE wire to the Key Buzzer,
through the diode in the Key Buzzer, through the D K BLUE
WHT STR wire to the cowl connector (where it junctions
with the D K BLUE wire to the oil pressure switch, and the
PINK wire to the ELECTRIC FUEL fuse), through the D K
BLUE wire to the oil pressure switch, through the oil
pressure switch to the PURPLE wire (no oil pressure) to the
starter solenoid, the ground through the starter solenoid
2. Or through the D K BLUE wire to the harness
junction, through the D K G R E E N wire, to the temperature
switch to ground (switch closed, engine overheated).
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