NOT OK
1
3
4
• INSTALL FUEL PRESSURE GAUGE, 91-16850 AND FUEL PRESSURE ADAPTER
• IGNITION “OFF” FOR 10 SECONDS.
• IGNITION “ON.” FUEL PUMP WILL RUN FOR ABOUT 2 SECONDS.
• NOTE FUEL PRESSURE, WITH PUMP RUNNING, SHOULD BE
28-32 PSI (193-221 kPa) AND HOLD STEADY WHEN PUMP STOPS.
FROM
CHART A-3
(2 OF 4)
OK
NO TROUBLE FOUND.
REVIEW THE TROUBLE-
SHOOTING SECTION.
PRESSURE BELOW
28 PSI (193 kPa)
PRESSURE ABOVE
32 PSI (221 kPa)
NO
PRESSURE
SEE
CHART A-7
4 OF 6
• IGNITION “OFF.”
• APPLY 12 VOLTS TO FUEL
PUMP CONNECTOR (GRAY
WIRE).
• LISTEN FOR FUEL PUMP
RUNNING.
HOLDS
CHECK:
• LEAKING PUMP FITTINGS,
OR HOSE.
• REPLACE FUEL PUMP
PUMP NOT RUNNINGPUMP RUNS
CHECK FOR:
• RESTRICTED FUEL LINE.
• DISCONNECTED HOSE
IF OK
CHECK FOR:
• OPEN WIRE IN CKT 120.
• OPEN PUMP GROUND
CKT 150.
IF OK
REPLACE ELECTRIC FUEL PUMP.
2
NOTE: THE IGNITION MAY HAVE TO BE CYCLED
“ON” MORE THAN ONCE TO OBTAIN MAXIMUM
PRESSURE. ALSO, IT IS NORMAL FOR THE PRESSURE
TO DROP SLIGHTLY WHEN THE PUMP STOPS.
• REMOVE FLAME
ARRESTOR AND VISUALLY
CHECK FOR LEAKAGE
FROM INJECTORS
LEAKAGE
REPLACE LEAKING
INJECTOR
PRESSURE BUT
NOT HOLDING
• INSTALL FUEL SHUT-OFF TOOL
• IGNITION “OFF” FOR 10 SECONDS.
• IGNITION “ON.”
• BLOCK FUEL RETURN LINE USING
SPECIAL TOOL (SHUT-OFF VALVE)
• PRESSURE SHOULD HOLD
NOT HOLDING
FAULTY FUEL PRESSURE
REGULATOR.
NO LEAKAGE
ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY) - 5E-6990-823225--1 1096
Throttle Body Injection Fuel System Diagnosis (Continued)
Chart A-7: (2 of 6)
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