2008 INFINITI QX56 Fuel

FL-1
ENGINE
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CONTENTS
FUEL SYSTEM
PRECAUTION ....... ........................................2
PRECAUTIONS .............................................. .....2
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
2
Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect ............................... ......
2
FUEL SYSTEM ....................................................4
General Precaution ............................................. ......4
PREPARATION ............................................5
PREPARATION .............................................. .....5
Special Service Tool ........................................... ......5
Commercial Service Tool ..........................................5
BASIC INSPECTION ....................................6
FUEL SYSTEM ............................................... .....6
Checking Fuel Line ............................................. ......6
REMOVAL AND INSTALLATION ................7
FUEL LEVEL SENSOR UNIT, FUEL FILTER
AND FUEL PUMP ASSEMBLY .........................
7
Removal and Installation ..................................... .....7
FUEL TANK ......................................................11
Removal and Installation ..................................... ....11
DISASSEMBLY AND ASSEMBLY ..............16
FUEL LEVEL SENSOR UNIT, FUEL FILTER
AND FUEL PUMP ASSEMBLY ........................
16
Disassembly and Assembly ................................. ....16
SERVICE DATA AND SPECIFICATIONS
(SDS) ............... .......................................... ...
17
SERVICE DATA AND SPECIFICATIONS
(SDS) .................................................................
17
Standard and Limit .............................................. ....17
Revision: March 2010 2008 QX56

FL-4
< PRECAUTION >
FUEL SYSTEM
FUEL SYSTEM
General PrecautionINFOID:0000000001534428
WARNING:
When replacing fuel line parts, be sure to observe the following.
• Put a “CAUTION: INFLAMMABLE” sign in the workshop.
• Be sure to work in a well ventilate d area and furnish workshop with a CO
2 fire extinguisher.
• Do not smoke while servicing fuel system. Keep open flames and sparks away from the work area.
CAUTION:
• Before removing fuel line parts, carry out the following procedures:
- Put drained fuel in an explosi on-proof container and put the lid on securely. Keep the container in
safe area.
- Release fuel pressure from the fuel lines. Refer to EC-494, "
Fuel Pressure Check" .
- Disconnect the battery negative terminal.
• Always replace O-rings and clamps with new ones.
• Do not kink or twist hoses when they are being installed.
• After connecting the fuel t ube quick connectors, make sure
the quick connectors are secure.
Ensure that the connector and resin tube do not contact any
adjacent parts.
• After installing tubes, make su re there is no fuel leakage at
connections in the following steps.
- Apply fuel pressure to fuel lines with turning ignition switch
ON (with engine stopped). Th en check for fuel leaks at con-
nections.
- Start the engine and rev it up and check for fuel leaks at con-
nections.
• Use only a Genuine NISSAN fuel filler cap as a replacement. If an incorrect fuel filler cap is used, the MIL may come on.
• For servicing “Evaporative Emission System” parts, refer to EC-498, "
Removal and Installation" .
• For servicing “On Board Refueling Vapor Recovery (ORVR)”
parts, refer to EC-496, "
How to Detect Fuel Vapor Leakage" .
PBIC1268E
Revision: March 2010 2008 QX56

PREPARATIONFL-5
< PREPARATION >
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PREPARATION
PREPARATION
Special Service ToolINFOID:0000000001534425
The actual shapes of the Kent-Moore
tools may differ from those of the special tools illustrated here.
Commercial Service ToolINFOID:0000000001534426
Tool number
(Kent-Moore No.)
Tool name Description
—
(J-46536)
Fuel tank lock ring tool Removing and installing fuel tank lock ring
LBIA0398E
Tool name
Description
Power tool Loosening bolts and nuts
PBIC0190E
Revision: March 2010 2008 QX56

FL-6
< BASIC INSPECTION >
FUEL SYSTEM
BASIC INSPECTION
FUEL SYSTEM
Checking Fuel LineINFOID:0000000001534429
Inspect fuel lines, fuel filler cap and fuel tank for improper attach-
ment, leaks, cracks, damage, loose connections, chafing or deterio-
ration.
If necessary, repair or replace damaged parts.
SMA803A
Revision: March 20102008 QX56

FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLYFL-7
< REMOVAL AND INSTALLATION >
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REMOVAL AND INSTALLATION
FUEL LEVEL SENSOR UNIT, FUEL FI
LTER AND FUEL PUMP ASSEMBLY
Removal and InstallationINFOID:0000000004900805
REMOVAL
WARNING:
Follow the “General Precautions” before working on the fuel system. Refer to FL-4, "
General Precau-
tion" .
1. Remove the fuel filler cap to release the pressure from inside the fuel tank.
2. Check the fuel level on level gauge. If the fuel gauge indicates more than the level as shown (full or almost full), drain the fuel
from the fuel tank until the fuel gauge indicates the level as
shown, or less.
• If the fuel pump does not operate, use the following procedureto drain the fuel to the specified level.
a. Insert a suitable hose of less than 15 mm (0.59 in) diameter into the fuel filler pipe through the fuel filler opening to drain the fuel
from fuel filler pipe.
b. Remove the LH rear wheel and tire. Refer to WT-48, "
Rotation" .
c. Remove the four clips and remove the rear fender protector, front.
1. Inspection hole cover 2. Inspection hole cover O-ring 3. Lock ring
4. Fuel level sensor, fuel filter, and fuel pump assembly 5. Fuel tank
6. Fuel level sensor, fuel filter, and fuel
pump assembly O-ring
LBIA0381E
WBIA0390E
Revision: March 2010 2008 QX56

FL-8
< REMOVAL AND INSTALLATION >
FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY
d. Disconnect the fuel filler hose from the fuel filler pipe.
e. Insert a suitable hose into the fuel tank through the fuel filler hose to drain the fuel from the fuel tank.
• As a guide, the fuel level reaches the fuel gauge position as shown, or less, when approximately 14
liters (3 3/4 US gal, 3 1/8 Imp gal) of fuel are drained from the fuel tank.
3. Release the fuel pressure from the fuel lines. Refer to EC-494, "
Fuel Pressure Check" .
4. Disconnect the battery negative terminal.
5. Remove the second row seat and the third row LH seat. Refer to SE-54, "
Removal and Installation" (sec-
ond row), SE-62, "
LH Side Seat" (third row).
6. Remove the second and third row rear seat belt buckles mounted on the floor. Refer to SB-7, "
Removal
and Installation of Second Row Seat Belt", SB-9, "Removal and Installation of Third Row Seat Belt".
7. Remove the LH center pillar trim, the LH rear trim panel, and the LH rear side door kick plate and weather
stripping. Refer to INT-14, "
Removal and Installation" .
8. Remove the second row rear center console and base, if equipped. Refer to IP-21, "
Removal and Installa-
tion" .
9. Reposition the floor carpet out of the way to access the inspection hole cover, located under the center LH
rear seat.
10. Remove the inspection hole cover by turning the retainers 90 °
degrees clockwise.
• Remove the O-ring.
11. Disconnect the fuel level sensor, fuel filter, and fuel pump assembly electrical connector, the EVAP hose, and the fuel feed
hose.
LBIA0386E
LBIA0382E
LBIA0383E
Revision: March 2010 2008 QX56

FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLYFL-9
< REMOVAL AND INSTALLATION >
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Disconnect the quick connector as follows:
• Hold the sides of the connector, push in tabs and pull out the
tube.
• If the connector and the tube are stuck together, push and pull several times until they start to move. Then disconnect them
by pulling.
CAUTION:
• The quick connector can be disconnected when the tabs
are completely depressed. Do not twist the quick connec-
tor more than necessary.
• Do not use any tools to di sconnect the quick connector.
• Keep the resin tube away from heat. Be especially careful
when welding near the tube.
• Prevent any acid liquids such as battery electrolyte, from getting on the resin tube.
• Do not bend or twist the resin tube during connection.
• Do not remove the remaining retainer on the hard tube (or the equivalent) except when the resin tube or the retainer
is replaced.
• When the resin tube or hard tube, or the equivalent, is replaced, also replace the retainer with a new one (white
colored retainer).
• To keep the quick connector clean and to avoid damage
and contamination from foreign materials, cover the quick
connector with plastic bags or suitable material as shown.
SFE562A
PBIC1268E
PBIC0163E
Revision: March 2010 2008 QX56

FL-10
< REMOVAL AND INSTALLATION >
FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY
12. Remove the lock ring using Tool.
13. Remove the fuel level sensor, fuel filter, and fuel pump assem-
bly. Remove and discard the fuel level sensor, fuel filter, and fuel
pump assembly O-ring.
CAUTION:
• Do not bend the float arm during removal.
• Avoid impacts such as drop ping when handling the com-
ponents.
INSTALLATION
Installation is in the reverse order of removal.
• For installation, use a new fuel level sens or, fuel filter, and fuel pump assembly O-ring.
• Connect the quick connector as follows:
- Check the connection for any damage or foreign materials.
- Align the connector with the pipe, then insert the c onnector straight into the pipe until a click is heard.
- After connecting the quick connector, make sure that the connec-
tion is secure by checking as follows:
- Pull the tube and the connector to make sure they are securely connected.
- Visually inspect the connector to make sure the two retainer tabs are securely connected.
INSPECTION AFTER INSTALLATION
1. Turn the ignition switch ON but do not start engi ne, then check the fuel pipes and hose connections for
leaks while applying fuel pressure to the system.
2. Start the engine and rev it above idle speed, then check t hat there are no fuel leaks at any of the fuel pipe
and hose connections. Tool number : — (J-46536)
LBIA0389E
PBIC1653E
Revision: March 2010
2008 QX56