Pontiac Fiero 1988 Service Manual page 478

DRIVEABILITY AND EMISSIONS - FUEL INJECTION (TBI) 6 E 2 A - 2 3
NOTICE: FUEL SYSTEM UNDER PRESSURE. TO AVOID FUEL
SPILLAGE, REFER TO FIELD SERVICE PROCEDURE
FOR TESTING OR MAKING REPAIRS REQUIRING
DISASSEMBL Y OF FUEL LINES OR FITTINGS.
CHART A-7
(Page 1 of 2)
FUEL SYSTEM DIAGNOSIS
2.5L "P" SERIES (TBI)
O
• FUEL TANK QUANTITY OK.
• IGNITION "OFF".
• INSTALL PRESSURE GAGE.
• JUMPER THE FUEL PUMP TEST TERMINAL TO 12 VOLTS
USING A FUSED JUMPER WIRE.
• NOTE PRESSURE, SHOULD BE 62-90 kPa (9-13psi).
NO PRESSURE
• LISTEN FOR PUMP RUNNING
AT FUELTANK.
PRESSURE, BUT LESS
THAN 62 kPa (9 PSI)
1
ABOVE 90 kPa (13 PSI)
CHART A-7
PAGE 2 OF 2
PUMP RUNS
PUMP NOT RUNNING
BLOCK FUEL RETURN LINE
BY PINCHING FLEXIBLE
HOSE, AND NOTE PRESSURE.
CHfcCK FOR;
- OPEN WIRE IN CKT 120.
- OPEN PUMP GROUND
WIRE CKT 150.
NO PRESSURE
PRESSURE, ABOVE
62 kPa (9 PSI)
IF OK
CHECK FOR,
- PLUGGED IN-LINE FILTER.
- PLUGGED PUMP INLET FILTER.
-RESTRICTED FUEL LINE.
- LEAKING PUMP RUBBER COUPLING.
REPLACE PRESSURE
REGULATOR.
II-OK
REPLACE IN-TANK FUEL PUMP.
CLEAR CODES AND CONFIRM "CLOSED LOOP " OPERATION AND NO "SERVICE ENGINE SOON" LIGHT. * 7S 3134-6E
10-6-86