Infiniti QX56 (Z62). Manual - part 651

EM-44

< REMOVAL AND INSTALLATION >

HIGH PRESSURE FUEL PUMP AND FUEL HOSE

4.

Remove fuel feed tube (pump side) (1).

5.

Disconnect fuel hose (2) from high pressure fuel pump.

6.

Remove high pressure fuel pump and lifter.

CAUTION:

After removing lifter, replace lifter with a new one.

7.

Disconnect quick connector (A) with the following procedure.

a.

Remove quick connector cap from quick connector connection.

b.

With the sleeve side of quick connector release facing quick connector, install quick connector release
onto fuel tube.

c.

Insert quick connector release into quick connector until sleeve
contacts and goes no further. Hold quick connector release on
that position.

CAUTION:

Inserting quick connector release hard will not disconnect
quick connector. Hold quick connector release where it
contacts and goes no further.

d.

Draw and pull out quick connector straight from fuel tube.

CAUTION:

• Pull quick connector holding (A) position as shown in the

figure.

• Never pull with lateral force applied. O-ring inside quick

connector may be damaged.

• Prepare container and cloth beforehand because fuel will leak out.
• Avoid fire and sparks.
• Keep parts away from heat source. Especially, be careful when welding is performed around

them.

• Never expose parts to battery electrolyte or other acids.
• Never bend or twist connection between quick connector and fuel feed hose (with damper) dur-

ing installation/removal.

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HIGH PRESSURE FUEL PUMP AND FUEL HOSE

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• To keep clean the connecting portion and to avoid dam-

age and foreign materials, cover them completely with
plastic bags, etc. or a similar item.

8.

Disconnect harness connector from low fuel pressure sensor.

9.

Remove fuel hose assembly.

10. Remove fuel pressure sensor.

CAUTION:

• Never allow water and foreign materials enter into the connector.
• Never reuse the dropped sensor.
• Carefully handle sensor avoiding shocks.
• Use hex head support installation for removal and installation of sensor.
• The contact surface of gasket must not have any stain or scoring by dust etc.

INSTALLATION

1.

Install O-ring to high pressure fuel pump. When handing new O-ring, paying attention to the following cau-
tion items:

CAUTION:

• Handle O-ring with bare hands. Never wear gloves.
• Lubricate O-ring with new engine oil.
• Never clean O-ring with solvent.
• Check that O-ring and its mating part are free of foreign material.
• When installing O-ring, be careful not to scratch it with tool or fingernails. Also be careful not to

twist or stretch O-ring. If O-ring was stretched while it was being attached, never insert it quickly
into fuel tube.

• Insert new O-ring straight into fuel rail. Never decenter or twist it.

2.

Install fuel pressure sensor.

3.

Install fuel hose assembly.
• Temporarily tighten mounting bolt (A) as shown in the figure.

4.

Install high pressure fuel pump to front cover.

CAUTION:

After removing lifter, replace lifter with a new one.

5.

Connect fuel feed hose to high pressure fuel pump.
NOTE:
• Never allow the machined edge of the high pressure fuel pump to contact with gasket.
• The gasket contact area must be free of dust and scratches.

PBIC2205E

: Engine front

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EM-46

< REMOVAL AND INSTALLATION >

HIGH PRESSURE FUEL PUMP AND FUEL HOSE

• Check that rotation stopper (A) of fuel feed hose contact high

pressure fuel pump.

6.

Tighten mounting bolts that are temporarily tightened in step 3.

7.

Connect harness connector to high pressure fuel pump.

8.

Install fuel pump connector protector.

9.

Connect harness connector to low fuel pressure sensor.

10. Note the following, and connect quick connector to install fuel feed hose.

a.

Check the connection for foreign material and damage.

b.

Align center to insert quick connector straightly into fuel tube.
NOTE:
The figure shows engine side as an example.
• Insert fuel tube into quick connector until the top spool on fuel

tube is inserted completely and the second level spool is posi-
tioned slightly below quick connector bottom end.

CAUTION:

• Hold “A” position in the figure when inserting fuel tube

into quick connector.

• Carefully align center to avoid inclined insertion to pre-

vent damage to O-ring inside quick connector.

• Insert until you hear a “click” sound and actually feel

the engagement.

• To avoid misidentification of engagement with a similar sound, be sure to perform the next

step.

c.

Before clamping fuel feed hose with hose clamps, pull quick connector hard by hand holding “A” position.
Check it is completely engaged (connected) so that it does not come out from fuel feed tube. 

d.

Install quick connector cap to quick connector connection. 
• Install so that the arrow mark on the side faces up.

CAUTION:

• Check that quick connector and fuel tube are securely fit

into quick connector cap installation groove.

• If quick connector cap cannot be installed smoothly,

quick connector may have not been installed correctly.
Check connection again.

11. Install in the reverse order of removal.

Inspection

INFOID:0000000006289555

INSPECTION AFTER INSTALLATION

Check for Fuel Leakage

1.

Turn ignition switch “ON” (with the engine stopped). With fuel pressure applied to fuel piping, check that
there is no fuel leakage at connection points.
NOTE:
Use mirrors for checking at points out of clear sight.

2.

Start the engine. With engine speed increased, check again that there is no fuel leakage at connection
points.

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HIGH PRESSURE FUEL PUMP AND FUEL HOSE

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CAUTION:

Never touch the engine immediately after it is stopped because the engine is extremely hot.