Pontiac Fiero 1988 Service Manual page 480

DRIVEABILITY AND EMISSIONS - FUEL INJECTION (TBI) 6E2-A-25
FROM
CHART
A-7
PAGE 1 OF 2
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HAS PRESSURE, BUT LESS THAN 9 PSI (62 kPa)
I
CHECK FOR RESTRICTED
FUEL FILTER OR LINE
BETWEEN IN-TANK FUEL
PUMP AND TEST GAGE
OK
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• ' IGNITION "OFF".
• DISCONNECT INJECTOR.
• BLOCK FUEL RETURN LINE BY
PINCHING FLEXIBLE HOSE.
• APPLY 12 VOLTS TO PUMP
TEST TERMINAL AND NOTE
PRESSURE
ABOVE 13 PSI
(89.63 kPa)
©
i
NOT OK
r~
REPLACE FILTER
OR REPAIR
RESTRICTION.
PRESSURE, BUT LESS
THAN 9 PSI (62 kPa).
CHART A-7
(Page 2 of 2)
FUEL SYSTEM DIAGNOSIS
2.5L " ? " SERIES (TBI)
1
ABOVE 13 PSI (89.63 kPa
1
• DISCONNECT INJECTOR CONNECTOR.
• DISCONNECT FUEL RETURN LINE
FLEXIBLE HOSE.
• ATTACH 5/16 I.D. FLEX HOSE TO THROTTLE
BODY SIDE OF RETURN LINE. INSERT THE OTHER
END IN AN APPROVED GASOLINE CONTAINER.
• NOTE FUEL PRESSURE WITHIN 2 SECONDS
AFTER IGNITION "ON".
ABOVE 13 PSI
(89.63 kPa)
9-13 PSI
(62 kPa-89.63 kPa)
IF LINES ARE OK, REPLACE
PRESSURE REGULATOR.
FAULTY IN-TANK
-FUEL PUMP
-COUPLING HOSE
-PUMP INLET FILTER
-WRONG FUEL PUMP
CHECK FOR RESTRICTED
FUEL RETURN LINE FROM
THROTTLE BODY TO
WHERE LINE WAS
DISCONNECTED.
IF LINE IS OK, REPLACE
PRESSURE REGULATOR.
LOCATE AND
CORRECT
RESTRICTED FUEL
RETURN LINE TO
FUELTANK.
CLEAR CODES AND CONFIRM "CLOSED LOOP " OPERATION AND NO "SERVICE ENGINE SOON" LIGHT.
*7S3135-6E
4-24-86