Throttle Body Injection Fuel System Diagnosis (Continued)
Chart A-7: (2 of 6)
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.
FROM
CHART A-3
(2
OF 4)
1
•
•
•
•
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.
OK
NOT OK
3
PRESSURE BUT
NOT HOLDING
PRESSURE BELOW
28 PSI (193 kPa)
PRESSURE ABOVE
32 PSI (221 kPa)
NO
PRESSURE
2
NO TROUBLE FOUND.
REVIEW THE TROUBLE-
SHOOTING SECTION.
•
REMOVE FLAME
SEE
CHART A-7
4 OF 6
ARRESTOR AND VISUALLY
CHECK FOR LEAKAGE
FROM INJECTORS
•
•
IGNITION “OFF.”
APPLY 12 VOLTS TO FUEL
PUMP CONNECTOR (GRAY
WIRE).
LEAKAGE
NO LEAKAGE
•
LISTEN FOR FUEL PUMP
RUNNING.
REPLACE LEAKING
INJECTOR
•
•
•
•
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
4
•
HOLDS
NOT HOLDING
FAULTY FUEL PRESSURE
REGULATOR.
CHECK:
•
LEAKING PUMP FITTINGS,
OR HOSE.
•
REPLACE FUEL PUMP
PUMP RUNS
CHECK FOR:
PUMP NOT RUNNING
CHECK FOR:
•
•
RESTRICTED FUEL LINE.
DISCONNECTED HOSE
•
•
OPEN WIRE IN CKT 120.
OPEN PUMP GROUND
CKT 150.
IF OK
IF OK
REPLACE ELECTRIC FUEL PUMP.
Index
90-823224--2 796
ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY) - 5C-67
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1993, 1994, 1995, 1996, 1997 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
Marine readers have rated 1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 4.5 out of 5.0 based on 4 product reviews. Hugely helpful service manual! Perfect. Thank you!
Manuals are all Important for Technician
This book is invaluable if you do your own repairs. Great book.
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