Jeep Cherokee 1999 Electronic Service Manual page 1192

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FUEL DELIVERY SYSTEM . . . . . . . . . . . . . . . . . . . 1
DESCRIPTION AND OPERATION
FUEL DELIVERY SYSTEM . . . . . . . . . . . . . . . . . . 3
FUEL FILTER/FUEL PRESSURE REGULATOR . . . 4
FUEL GAUGE SENDING UNIT . . . . . . . . . . . . . . . 4
FUEL INJECTORS . . . . . . . . . . . . . . . . . . . . . . . . 5
FUEL PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
FUEL PUMP MODULE . . . . . . . . . . . . . . . . . . . . . 3
FUEL RAIL/FUEL DAMPER—2.5L ENGINE . . . . . . 5
FUEL RAIL—4.0L ENGINE . . . . . . . . . . . . . . . . . . 5
FUEL REQUIREMENTS . . . . . . . . . . . . . . . . . . . . 1
FUEL TANK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
FUEL TANK FILLER TUBE CAP . . . . . . . . . . . . . . 6
PCM REPLACEMENT . . . . . . . . . . . . . . . . . . . . . 1
QUICK-CONNECT FITTINGS . . . . . . . . . . . . . . . . 6
ROLLOVER VALVE(S) . . . . . . . . . . . . . . . . . . . . . 5
DIAGNOSIS AND TESTING
FUEL GAUGE SENDING UNIT . . . . . . . . . . . . . . 10
FUEL INJECTOR TEST . . . . . . . . . . . . . . . . . . . 10
FUEL PRESSURE LEAK DOWN TEST . . . . . . . . . 7
FUEL PUMP AMPERAGE TEST . . . . . . . . . . . . . . 8
FUEL PUMP CAPACITY TEST . . . . . . . . . . . . . . . 7
FUEL PUMP PRESSURE TEST—ALL ENGINES
WITH PRESSURE TEST PORT . . . . . . . . . . . . . 6
DESCRI PT I ON AN D OPERAT I ON
PCM REPLACEMENT
U S E THE D RB S CAN TOOL TO REP ROGRAM
THE N EW P OWERTRAIN CON TROL MOD U LE
(P CM) WITH THE VEHICLES ORIGIN AL ID EN -
TIF ICATION N U MB ER (VIN ) AN D THE VEHI-
CLES ORIGIN AL MILEAGE. IF THIS S TEP IS
N OT D ON E, A D IAGN OS TIC TROU B LE COD E
(D TC) MAY B E S ET.
FUEL SYSTEM
CON T EN T S
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FU EL DELI V ERY SY ST EM
INDEX
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FUEL INJECTION SYSTEM . . . . . . . . . . . . . . . . . 23
SERVICE PROCEDURES
FUEL SYSTEM PRESSURE RELEASE
PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . 10
FUEL TUBES/LINES/HOSES AND CLAMPS . . . . 10
QUICK-CONNECT FITTINGS . . . . . . . . . . . . . . . 11
REMOVAL AND INSTALLATION
ACCELERATOR PEDAL . . . . . . . . . . . . . . . . . . . 20
FUEL FILTER/FUEL PRESSURE REGULATOR . . 13
FUEL GAUGE SENDING UNIT . . . . . . . . . . . . . . 15
FUEL INJECTOR RAIL—2.5L ENGINE . . . . . . . . 16
FUEL INJECTOR RAIL—4.0L ENGINE . . . . . . . . 17
FUEL INJECTORS . . . . . . . . . . . . . . . . . . . . . . . 18
FUEL PUMP INLET FILTER . . . . . . . . . . . . . . . . 15
FUEL PUMP MODULE . . . . . . . . . . . . . . . . . . . . 14
FUEL TANK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
FUEL TANK FILLER TUBE CAP . . . . . . . . . . . . . 20
THROTTLE CABLE . . . . . . . . . . . . . . . . . . . . . . 21
SPECIFICATIONS
FUEL SYSTEM PRESSURE . . . . . . . . . . . . . . . . 22
FUEL TANK CAPACITY . . . . . . . . . . . . . . . . . . . 22
TORQUE CHART . . . . . . . . . . . . . . . . . . . . . . . . 22
FUEL REQUIREMENTS
You r en gin e is design ed t o m eet a ll em ission s r eg-
u la t ion s a n d pr ovide excellen t fu el econ om y a n d per-
for m a n ce wh en u sin g h igh qu a lit y u n lea ded ga solin e
h a vin g a n oct a n e r a t in g of 87. Th e u se of pr em iu m
ga solin e is n ot r ecom m en ded. Th e u se of pr em iu m
ga solin e will pr ovide n o ben efit over h igh qu a lit y r eg-
u la r ga solin e, a n d in som e cir cu m st a n ces m a y r esu lt
in poor er per for m a n ce.
Ligh t spa r k kn ock a t low en gin e speeds is n ot
h a r m fu l t o you r en gin e. H owever, con t in u ed h ea vy
spa r k kn ock a t h igh speeds ca n ca u se da m a ge a n d
im m edia t e ser vice is r equ ir ed. E n gin e da m a ge r esu lt -
FUEL SYSTEM 14 - 1
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