ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY) - 5E-6590-823225--1 1096
Multi-Port Injection Fuel System Diagnosis (Continued)
Chart A-7: (4 of 6)
2
• IGNITION “OFF.”
• BLOCK FUEL RETURN LINE FOLLOWING
INSTRUCTIONS.
• CYCLE IGNITION “ON.” PRESSURE
SHOULD RISE ABOVE 38 PSI (262 kPa).
CONTINUED FROM
CHART A-7
(2 OF 6)
1
3
ABOVE 38 PSI (262 kPa)
OK NOT OK
IF LINE OK, REPLACE FUEL
PRESSURE REGULATOR.
HAS PRESSURE, BUT LESS
THAN 34 PSI (234 kPa)
CHECK FOR RESTRICTED
FUEL LINES.
ABOVE 38 PSI (262 kPa) 34-38 PSI (234-262 kPa)
CHECK FOR RESTRICTED FUEL
RETURN LINE FROM FUEL
PRESSURE REGULATOR TO
POINT WHERE FUEL LINE WAS
DISCONNECTED.
REPAIR FUEL LINE
AND RECHECK.
ABOVE 38 PSI
(262 kPa)
FAULTY PRESSURE
REGULATOR.
HAS PRESSURE, BUT LESS
THAN 34 PSI (234 kPa)
FAULTY
FUEL PUMP
• DISCONNECT FUEL RETURN LINE.
• FOLLOWING MANUFACTURER’S INSTRUCTIONS, ATTACH
FLEX HOSE TO RETURN LINE. INSERT THE OTHER END IN AN
APPROVED GASOLINE CONTAINER. NOTE FUEL PRESSURE
WITHIN 2 SECONDS AFTER IGNITION IS TURNED “ON.”
LOCATE AND CORRECT
RESTRICTED FUEL RETURN
LINE TO VAPOR SEPARATOR
TANK.
* NOTE: THE IGNITION MAY HAVE TO BE CYCLED
“ON” MORE THAN ONCE TO OBTAIN MAXI-
MUM PRESSURE.
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