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FUEL PUMP
DESCRIPTION
The fuel pump is located inside of the fuel pump
module. A 12 volt, permanent magnet, electric motor
powers the fuel pump.
OPERATION
Voltage to operate the electric pump is supplied
through the fuel pump relay.
Fuel is drawn in through a filter at the bottom of
the module and pushed through the electric motor
gearset to the pump outlet.
Check Valve Operation: The pump outlet con-
tains a one-way check valve to prevent fuel flow back
into the tank and to maintain fuel supply line pres-
sure (engine warm) when pump is not operational. It
is also used to keep the fuel supply line full of gaso-
line when pump is not operational. After the vehicle
has cooled down, fuel pressure may drop to 0 psi
(cold fluid contracts), but liquid gasoline will remain
in fuel supply line between the check valve and fuel
injectors. Fuel pressure that has dropped to 0
psi on a cooled down vehicle (engine off) is a
normal condition. Refer to the Fuel Pressure Leak
Down Test for more information.
FUEL GAUGE SENDING UNIT
DESCRIPTION
The fuel gauge sending unit (fuel level sensor) is
attached to the side of the fuel pump module. The
sending unit consists of a float, an arm, and a vari-
able resistor track (card).
OPERATION
The fuel pump module has 4 different circuits
(wires). Two of these circuits are used for the fuel
gauge sending unit for fuel gauge operation, and for
certain OBD II emission requirements. The other 2
wires are used for electric fuel pump operation.
For Fuel Gauge Operation: A constant input
voltage source of about 12 volts (battery voltage) is
supplied to the resistor track on the fuel gauge send-
ing unit. This is fed directly from the Powertrain
Control Module (PCM). NOTE: For diagnostic pur-
poses, this 12V power source can only be veri-
fied with the circuit opened (fuel pump module
electrical connector unplugged). With the con-
nectors plugged, output voltages will vary from
about.6 volts at FULL, to about 8.6 volts at
EMPTY (about 8.6 volts at EMPTY for Jeep
models, and about 7.0 volts at EMPTY for
Dodge Truck models). The resistor track is used to
vary the voltage (resistance) depending on fuel tank
float level. As fuel level increases, the float and arm
move up, which decreases voltage. As fuel level
decreases, the float and arm move down, which
increases
voltage.
The
varied
voltage
signal
is
returned back to the PCM through the sensor return
circuit.
Both of the electrical circuits between the fuel
gauge sending unit and the PCM are hard-wired (not
multi-plexed). After the voltage signal is sent from
the resistor track, and back to the PCM, the PCM
will interpret the resistance (voltage) data and send
a message across the multi-plex bus circuits to the
instrument panel cluster. Here it is translated into
the appropriate fuel gauge level reading. Refer to
Instrument Panel for additional information.
For OBD II Emission Monitor Requirements:
The PCM will monitor the voltage output sent from
the resistor track on the sending unit to indicate fuel
level. The purpose of this feature is to prevent the
OBD II system from recording/setting false misfire
and fuel system monitor diagnostic trouble codes.
The feature is activated if the fuel level in the tank
is less than approximately 15 percent of its rated
capacity. If equipped with a Leak Detection Pump
(EVAP system monitor), this feature will also be acti-
vated if the fuel level in the tank is more than
approximately 85 percent of its rated capacity.
FUEL FILTER/FUEL PRESSURE REGULATOR
DESCRIPTION
The combination fuel filter and fuel pressure regu-
lator is located on the top of fuel pump module (Fig.
1).
OPERATION
A combination fuel filter and fuel pressure regula-
tor is used on all engines. A separate frame mounted
fuel filter is not used with any engine.
Fuel Pressure Regulator Operation: The pres-
sure regulator is a mechanical device that is not con-
trolled by engine vacuum or the Powertrain Control
Module (PCM).
The regulator is calibrated to maintain fuel system
operating pressure of approximately 339 kPa
6
34
kPa (49.2 psi
6
5 psi) at the fuel injectors. It con-
tains a diaphragm, calibrated springs and a fuel
return valve. The internal fuel filter is also part of
the assembly.
Fuel is supplied to the filter/regulator by the elec-
tric fuel pump through an opening tube at the bot-
tom of filter/regulator (Fig. 3).
The regulator acts as a check valve to maintain
some fuel pressure when the engine is not operating.
This will help to start the engine. A second check
valve is located at the outlet end of the electric fuel
pump. Refer to Fuel Pump—Description and
XJ
FUEL SYSTEM
14 - 3
DESCRIPTION AND OPERATION (Continued)
Содержание Cherokee 2000
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Страница 96: ...Fig 105 Gear Tooth Contact Patterns 3 60 TUBE 181 AND 186 FBI AXLE XJ ADJUSTMENTS Continued...
Страница 100: ...Installer D 144 Installer W 262 3 64 TUBE 181 AND 186 FBI AXLE XJ SPECIAL TOOLS Continued...
Страница 134: ...Fig 79 Gear Tooth Contact Patterns 3 98 194 RBI AXLE XJ ADJUSTMENTS Continued...
Страница 166: ...Fig 59 Gear Tooth Contact Patterns 3 130 8 1 4 REAR AXLE XJ ADJUSTMENTS Continued...
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Страница 290: ...Wiring Diagram Symbols 8W 01 6 8W 01 GENERAL INFORMATION XJ DESCRIPTION AND OPERATION Continued...
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Страница 633: ...Fig 1 Front End Lighting XJ 8W 90 CONNECTOR LOCATIONS 8W 90 9 DESCRIPTION AND OPERATION Continued...
Страница 634: ...Fig 2 Left Engine Compartment 2 5L Engine LHD 8W 90 10 8W 90 CONNECTOR LOCATIONS XJ DESCRIPTION AND OPERATION Continued...
Страница 635: ...Fig 3 Left Engine Compartment 2 5L Engine RHD XJ 8W 90 CONNECTOR LOCATIONS 8W 90 11 DESCRIPTION AND OPERATION Continued...
Страница 639: ...Fig 8 Engine Compartment Components LHD XJ 8W 90 CONNECTOR LOCATIONS 8W 90 15 DESCRIPTION AND OPERATION Continued...
Страница 640: ...Fig 9 Engine Compartment Components RHD 8W 90 16 8W 90 CONNECTOR LOCATIONS XJ DESCRIPTION AND OPERATION Continued...
Страница 641: ...Fig 10 Left Engine Compartment 4 0L Engine LHD XJ 8W 90 CONNECTOR LOCATIONS 8W 90 17 DESCRIPTION AND OPERATION Continued...
Страница 642: ...Fig 11 Left Engine Compartment 4 0L Engine RHD 8W 90 18 8W 90 CONNECTOR LOCATIONS XJ DESCRIPTION AND OPERATION Continued...
Страница 647: ...Fig 16 2 5L Engine XJ 8W 90 CONNECTOR LOCATIONS 8W 90 23 DESCRIPTION AND OPERATION Continued...
Страница 648: ...Fig 17 4 0L Engine 8W 90 24 8W 90 CONNECTOR LOCATIONS XJ DESCRIPTION AND OPERATION Continued...
Страница 649: ...Fig 18 4 0L Engine XJ 8W 90 CONNECTOR LOCATIONS 8W 90 25 DESCRIPTION AND OPERATION Continued...
Страница 650: ...Fig 19 Transmission Connectors 2 5L Engine 8W 90 26 8W 90 CONNECTOR LOCATIONS XJ DESCRIPTION AND OPERATION Continued...
Страница 651: ...Fig 20 Transmission Connectors 4 0L Engine XJ 8W 90 CONNECTOR LOCATIONS 8W 90 27 DESCRIPTION AND OPERATION Continued...
Страница 652: ...Fig 21 Instrument Panel LHD 8W 90 28 8W 90 CONNECTOR LOCATIONS XJ DESCRIPTION AND OPERATION Continued...
Страница 653: ...Fig 22 Instrument Panel LHD XJ 8W 90 CONNECTOR LOCATIONS 8W 90 29 DESCRIPTION AND OPERATION Continued...
Страница 654: ...Fig 23 Instrument Panel RHD 8W 90 30 8W 90 CONNECTOR LOCATIONS XJ DESCRIPTION AND OPERATION Continued...
Страница 655: ...Fig 24 Instrument Panel RHD XJ 8W 90 CONNECTOR LOCATIONS 8W 90 31 DESCRIPTION AND OPERATION Continued...
Страница 656: ...Fig 25 Under Dash Components 8W 90 32 8W 90 CONNECTOR LOCATIONS XJ DESCRIPTION AND OPERATION Continued...
Страница 657: ...Fig 26 Left Side Body LHD XJ 8W 90 CONNECTOR LOCATIONS 8W 90 33 DESCRIPTION AND OPERATION Continued...
Страница 658: ...Fig 27 Left Side Body RHD 8W 90 34 8W 90 CONNECTOR LOCATIONS XJ DESCRIPTION AND OPERATION Continued...
Страница 659: ...Fig 28 Left Rear Body XJ 8W 90 CONNECTOR LOCATIONS 8W 90 35 DESCRIPTION AND OPERATION Continued...
Страница 660: ...Fig 29 Right Side Body and Junction Block 8W 90 36 8W 90 CONNECTOR LOCATIONS XJ DESCRIPTION AND OPERATION Continued...
Страница 662: ...Fig 31 Liftgate 8W 90 38 8W 90 CONNECTOR LOCATIONS XJ DESCRIPTION AND OPERATION Continued...
Страница 663: ...Fig 32 Center Console LHD XJ 8W 90 CONNECTOR LOCATIONS 8W 90 39 DESCRIPTION AND OPERATION Continued...
Страница 664: ...Fig 33 Trailer Tow Fig 34 Headliner 8W 90 40 8W 90 CONNECTOR LOCATIONS XJ DESCRIPTION AND OPERATION Continued...
Страница 665: ...Fig 35 Steering Column XJ 8W 90 CONNECTOR LOCATIONS 8W 90 41 DESCRIPTION AND OPERATION Continued...
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Страница 679: ...Fig 9 Front End Lighting Splices XJ 8W 95 SPLICE LOCATIONS 8W 95 13 DESCRIPTION AND OPERATION Continued...
Страница 680: ...Fig 10 Engine Wiring Splices 4 0L Engine 8W 95 14 8W 95 SPLICE LOCATIONS XJ DESCRIPTION AND OPERATION Continued...
Страница 681: ...Fig 11 Engine Wiring Splices 2 5L Engine XJ 8W 95 SPLICE LOCATIONS 8W 95 15 DESCRIPTION AND OPERATION Continued...
Страница 682: ...Fig 12 Instrument Panel Wiring Splices LHD 8W 95 16 8W 95 SPLICE LOCATIONS XJ DESCRIPTION AND OPERATION Continued...
Страница 683: ...Fig 13 Instrument Panel Wiring Splices RHD XJ 8W 95 SPLICE LOCATIONS 8W 95 17 DESCRIPTION AND OPERATION Continued...
Страница 684: ...Fig 14 Instrument Panel to Body Harness Splices 8W 95 18 8W 95 SPLICE LOCATIONS XJ DESCRIPTION AND OPERATION Continued...
Страница 685: ...Fig 15 Left Side Body Harness Splices XJ 8W 95 SPLICE LOCATIONS 8W 95 19 DESCRIPTION AND OPERATION Continued...
Страница 686: ...Fig 16 Right Side Body Harness Splices 8W 95 20 8W 95 SPLICE LOCATIONS XJ DESCRIPTION AND OPERATION Continued...
Страница 690: ...Fig 23 Headliner Splices 8W 95 24 8W 95 SPLICE LOCATIONS XJ DESCRIPTION AND OPERATION Continued...
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Страница 826: ...Fig 6 Frame Dimensions 13 8 FRAME AND BUMPERS XJ SPECIFICATIONS Continued...
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Страница 949: ...6747 1A Adapter Fixture MD 998805 Installer Seal XJ AX5 MANUAL TRANSMISSION 21 41 SPECIAL TOOLS Continued...
Страница 998: ...Fig 1 30RH Automatic Transmission 21 90 AUTOMATIC TRANSMISSION 30RH XJ DESCRIPTION AND OPERATION Continued...
Страница 1023: ...Fig 33 Switch Valve Torque Converter Unlocked XJ AUTOMATIC TRANSMISSION 30RH 21 115 DESCRIPTION AND OPERATION Continued...
Страница 1024: ...Fig 34 Switch Valve Torque Converter Locked 21 116 AUTOMATIC TRANSMISSION 30RH XJ DESCRIPTION AND OPERATION Continued...
Страница 1110: ...HYDRAULIC FLOW IN PARK NEUTRAL 21 202 AUTOMATIC TRANSMISSION 30RH XJ SCHEMATICS AND DIAGRAMS Continued...
Страница 1111: ...HYDRAULIC FLOW IN D FIRST GEAR XJ AUTOMATIC TRANSMISSION 30RH 21 203 SCHEMATICS AND DIAGRAMS Continued...
Страница 1112: ...HYDRAULIC FLOW IN D SECOND GEAR 21 204 AUTOMATIC TRANSMISSION 30RH XJ SCHEMATICS AND DIAGRAMS Continued...
Страница 1113: ...HYDRAULIC FLOW IN D THIRD GEAR XJ AUTOMATIC TRANSMISSION 30RH 21 205 SCHEMATICS AND DIAGRAMS Continued...
Страница 1114: ...HYDRAULIC FLOW IN D THIRD GEAR CONVERTER CLUTCH APPLIED 21 206 AUTOMATIC TRANSMISSION 30RH XJ SCHEMATICS AND DIAGRAMS Continued...
Страница 1115: ...HYDRAULIC FLOW AT PART THROTTLE 3 2 KICKDOWN XJ AUTOMATIC TRANSMISSION 30RH 21 207 SCHEMATICS AND DIAGRAMS Continued...
Страница 1116: ...HYDRAULIC FLOW AT FULL THROTTLE 3 2 KICKDOWN 21 208 AUTOMATIC TRANSMISSION 30RH XJ SCHEMATICS AND DIAGRAMS Continued...
Страница 1117: ...HYDRAULIC FLOW IN MANUAL SECOND XJ AUTOMATIC TRANSMISSION 30RH 21 209 SCHEMATICS AND DIAGRAMS Continued...
Страница 1118: ...HYDRAULIC FLOW IN MANUAL LOW 21 210 AUTOMATIC TRANSMISSION 30RH XJ SCHEMATICS AND DIAGRAMS Continued...
Страница 1119: ...HYDRAULIC FLOW IN REVERSE XJ AUTOMATIC TRANSMISSION 30RH 21 211 SCHEMATICS AND DIAGRAMS Continued...
Страница 1243: ...Fig 299 Upper Body Components XJ AW 4 AUTOMATIC TRANSMISSION 21 335 DISASSEMBLY AND ASSEMBLY Continued...
Страница 1247: ...AW 4 BUSHING AND PISTON CLEARANCE XJ AW 4 AUTOMATIC TRANSMISSION 21 339 SPECIFICATIONS Continued...
Страница 1248: ...AW 4 RETAINER AND PISTON SPECIFICATIONS 21 340 AW 4 AUTOMATIC TRANSMISSION XJ SPECIFICATIONS Continued...
Страница 1250: ...AW 4 VALVE AND SPRING IDENTIFICATION 21 342 AW 4 AUTOMATIC TRANSMISSION XJ SPECIFICATIONS Continued...
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Страница 1327: ...SPECIFICATIONS TORQUE CHART DESCRIPTION TORQUE Lug Nut 1 2 X 20 with 60 Cone 115 150 N m 85 115 ft lbs XJ TIRES AND WHEELS 22 11...
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Страница 1353: ...Fig 3 Hood Components XJ BODY 23 25 REMOVAL AND INSTALLATION Continued...
Страница 1396: ...WELD LOCATIONS UPPER COWL 23 68 BODY XJ SPECIFICATIONS Continued...
Страница 1397: ...UPPER COWL XJ BODY 23 69 SPECIFICATIONS Continued...
Страница 1398: ...COWL 23 70 BODY XJ SPECIFICATIONS Continued...
Страница 1399: ...A PILLAR XJ BODY 23 71 SPECIFICATIONS Continued...
Страница 1400: ...A PILLAR 23 72 BODY XJ SPECIFICATIONS Continued...
Страница 1401: ...A PILLAR XJ BODY 23 73 SPECIFICATIONS Continued...
Страница 1402: ...A PILLAR 23 74 BODY XJ SPECIFICATIONS Continued...
Страница 1403: ...B PILLAR XJ BODY 23 75 SPECIFICATIONS Continued...
Страница 1404: ...D PILLAR 23 76 BODY XJ SPECIFICATIONS Continued...
Страница 1405: ...FUEL FILLER OPENING XJ BODY 23 77 SPECIFICATIONS Continued...
Страница 1406: ...CARGO AREA FLOOR PAN 23 78 BODY XJ SPECIFICATIONS Continued...
Страница 1407: ...ROOF AND D PILLAR XJ BODY 23 79 SPECIFICATIONS Continued...
Страница 1408: ...LIFTGATE OPENING 23 80 BODY XJ SPECIFICATIONS Continued...
Страница 1409: ...ROOF XJ BODY 23 81 SPECIFICATIONS Continued...
Страница 1410: ...ROOF 23 82 BODY XJ SPECIFICATIONS Continued...
Страница 1411: ...FRAME RAIL XJ BODY 23 83 SPECIFICATIONS Continued...
Страница 1412: ...FRAME RAIL 23 84 BODY XJ SPECIFICATIONS Continued...
Страница 1413: ...FRAME RAIL XJ BODY 23 85 SPECIFICATIONS Continued...
Страница 1414: ...FRAME RAIL 23 86 BODY XJ SPECIFICATIONS Continued...
Страница 1415: ...REINFORCEMENT XJ BODY 23 87 SPECIFICATIONS Continued...
Страница 1416: ...FRONT INNER FENDER 23 88 BODY XJ SPECIFICATIONS Continued...
Страница 1417: ...FRONT INNER FENDER AND RADIATOR CLOSURE PANEL XJ BODY 23 89 SPECIFICATIONS Continued...
Страница 1418: ...REINFORCEMENT 23 90 BODY XJ SPECIFICATIONS Continued...
Страница 1419: ...FRONT FENDER XJ BODY 23 91 SPECIFICATIONS Continued...
Страница 1420: ...BODY SIDE 23 92 BODY XJ SPECIFICATIONS Continued...
Страница 1421: ...REAR WHEELHOUSE XJ BODY 23 93 SPECIFICATIONS Continued...
Страница 1422: ...REAR INNER WHEELHOUSE 23 94 BODY XJ SPECIFICATIONS Continued...
Страница 1423: ...BODY SIDE XJ BODY 23 95 SPECIFICATIONS Continued...
Страница 1424: ...BODY SIDE 23 96 BODY XJ SPECIFICATIONS Continued...
Страница 1425: ...BODY SIDE XJ BODY 23 97 SPECIFICATIONS Continued...
Страница 1426: ...BODY SIDE 23 98 BODY XJ SPECIFICATIONS Continued...
Страница 1427: ...BODY SIDE XJ BODY 23 99 SPECIFICATIONS Continued...
Страница 1428: ...BODY SIDE 23 100 BODY XJ SPECIFICATIONS Continued...
Страница 1429: ...UNDERBODY XJ BODY 23 101 SPECIFICATIONS Continued...
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Страница 1435: ...UNDERBODY XJ BODY 23 107 SPECIFICATIONS Continued...
Страница 1436: ...UNDERBODY 23 108 BODY XJ SPECIFICATIONS Continued...
Страница 1437: ...UNDERBODY XJ BODY 23 109 SPECIFICATIONS Continued...
Страница 1438: ...UNDERBODY 23 110 BODY XJ SPECIFICATIONS Continued...
Страница 1439: ...UNDERBODY XJ BODY 23 111 SPECIFICATIONS Continued...
Страница 1440: ...BODY SEALING LOCATIONS APPLICATION METHODS 23 112 BODY XJ SPECIFICATIONS Continued...
Страница 1441: ...COWL AND DASH PANEL XJ BODY 23 113 SPECIFICATIONS Continued...
Страница 1442: ...DASH PANEL AND FLOOR PAN 23 114 BODY XJ SPECIFICATIONS Continued...
Страница 1443: ...FLOOR PAN XJ BODY 23 115 SPECIFICATIONS Continued...
Страница 1444: ...REAR INNER WHEELHOUSE 23 116 BODY XJ SPECIFICATIONS Continued...
Страница 1445: ...FRONT INNER WHEELHOUSE XJ BODY 23 117 SPECIFICATIONS Continued...
Страница 1446: ...BODY SIDE 23 118 BODY XJ SPECIFICATIONS Continued...
Страница 1447: ...BODY SIDE XJ BODY 23 119 SPECIFICATIONS Continued...
Страница 1448: ...BODY SIDE 23 120 BODY XJ SPECIFICATIONS Continued...
Страница 1449: ...ROOF PANEL XJ BODY 23 121 SPECIFICATIONS Continued...
Страница 1450: ...FUEL FILLER HOUSING 23 122 BODY XJ SPECIFICATIONS Continued...
Страница 1451: ...LIFTGATE OPENING XJ BODY 23 123 SPECIFICATIONS Continued...
Страница 1452: ...STRUCTURAL ADHESIVE LOCATIONS LEFT QUARTER PANEL 23 124 BODY XJ SPECIFICATIONS Continued...
Страница 1453: ...REAR WHEELHOUSE XJ BODY 23 125 SPECIFICATIONS Continued...
Страница 1454: ...ROOF BOWS 23 126 BODY XJ SPECIFICATIONS Continued...
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