Pontiac TRANS AM 1977 Service Manual page 755

FUEL SYSTEM
FUEL PUMP INOPERATIVE
-
TEMPERATURE PRESSURE
LAMP NOT OK
u
ENGINE STARTS WHEN CRANKED, RUNS BRIEFLY
(UNTIL CARBURETOR FLOAT BOWL
RUNS DRY) THEN STALLS
TEST LAMP
OFF
I
OILPRESSURE SWITCH. IGNITION
I N RUN POSITION. ENGINE STOPPED.
I
-
REPAIR OPEN I N PINK WIRE
START ENGINE. IF POSSIBLE. FROM IGNITION SWITCH TO
I
OIL PRESSURE SWITCH.
ENGINE WILL ENGINE WILL
RUN
NOT RUN
I
TEST LAMP ON
I
CONNECTA JUMPER WlRE BETWEEN
BOTH TERMINALS
CONNECT TEST LAMP TO GROUND A N
1
PROBE THE DARK BLUE WIRE A T THE
CONNECT TEST LAMP TO GROUND
OIL PRESSURE SWITCH.
CONNECTOR. IGNITION I N RUN POSITION
AND PROBE DARK BLUE WIRE AT
3-WIRE CONNECTOR TO FUEL
I
I
TANK I N TRUNK.
TEST LAMP
ON
TEST LAMP
OFF
REPLACE O I L PRESSURE
AT THIS POINT THE O I L PRESSURE
SWITCH.
SWITCH IS OK. SHUT OFF ENGINE.
CONNECT
A
JUMPER WIRE BETWEEN CONNECT TEMPERATURE LAMP TO GROUND-
CONNECT TEST LAMP TO 12
THE PINK AND DARK BLUE WIRES
AND PROBE DARK BLUE WIRE I N REAR BODY
$ ~ ~ S A ~ ~ ~ ~ ~ ~ ~
AT T H E O I L PRESSURE SWITCH
CONNECTOR, I N TRUNK. LEFT SIDE,
CONNECTOR. IGNITION I N RUN
NEAR WHEELHOUSE.
I N TRUNK TO TANK.
POSITION. I
2
AND PROBE BOTH TERMINALS OF
ELECTRIC FUEL FUSE. IGNITION
I
I
I
I
TEST LAMP O N TEST LAMP OFF
ONE TERMINAL ONLY BOTH TERMINALS
I
TEST LAMP
1
OFF
TEST LAMP
ON
TEST LAMP TEST LAMP
ON OFF
I
I
REMOVE FUEL TANK AND CHECK-
REPAIR BLACK
( D A R K BLUE WRIE FROM 3-WIRE
1
(GROUND WIRE AS
I
CONNECTOR TO FUEL PUMP. CHECK
REOUIRED. THE
BLACK GROUND WIRE FROM 3-WIRE
CONNECTOR TO TANK. I T IS POSSIBLE
FOR THE PUMP WIRES TO BE REVERSED.
IF THlS IS THE CASE THE PUMP WILL
W l R E S H O U L D B E A T T A C H t D T O T H E
I
PUMP TERMINAL CLOSEST TO THE TANK
I
~-
.
1
UNIT FLOAT.
I
TEST LAMP
0
TEST LAMP
1 7 1
3.WIRE CONNECTOR TO THE TANK,
CONNECTOR (NEAR FUSE
PANEL).
REPLACE THE FUELPUMP.
TEST LAMP
GI
TEST LAMP
I_j TEST LAMP
REPAIR SHORT I N DARK BLUE
REPAIR OPEN CIRCUIT I N
REPAIR OPEN CIRCUIT FROM
REPAIR SHORT I N DARK BLUE
DARK BLUE WIRE FROM FRONT
FRONT BODY CONNECTOR TO
CONNECTOR TO 3-WIRE
WIRE FROM FUSE PANEL TO BODY CONNECTOR TO REAR
CONNECTOR I N TRUNK. REAR BODY CONNECTOR. BODY CONNECTOR I N TRUNK.
Fig. 6C-4 Electric Fuel Pump, Temperature-Pressure Indicator Lamp, And Key Buzzer Disgnosis