Infiniti FX35, FX50 (S51). Manual - part 971

EM-184

< REMOVAL AND INSTALLATION >

[VK50VE]

FUEL INJECTOR AND FUEL TUBE

• Loosen mounting bolts (b) first. Then loosen mounting bolts

(a) shown in the figure.

CAUTION:

Never tilt it, or remaining fuel in pipes may flow out from
pipes.

8.

Remove fuel injector (1) from fuel tube (3) as per the following:

a.

Open and remove clip (2).

b.

Remove fuel injector from fuel tube by pulling straight.

CAUTION:

• Be careful with remaining fuel that may go out from fuel

tube.

• Be careful not to damage injector nozzles during removal.
• Never bump or drop fuel injector.
• Never disassemble fuel injector.

9.

Disconnect sub harness connector from fuel injectors.

10. Remove fuel damper and fuel feed damper, if necessary.

INSTALLATION

1.

Install fuel damper (4) as per the following:

a.

Install new O-ring (3) to fuel tube (bank 1) (2) as shown. When
handling new O-ring, pay attention to the following caution
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 tube. Never decenter

or twist it.

b.

Install spacer (A) to fuel damper. Insert fuel damper straight into
fuel tube (bank 1).

CAUTION:

• Insert straight, check that the axis is lined up.
• Insert fuel damper at 130 N (13.3 kg, 29.2 lb) or less to pre-

vent damage to the parts

• Insert fuel damper until the rim (C) reaches the cap flange (B).

c.

Tighten mounting bolts evenly in turn.
• After tightening mounting bolts, check that there is no gap between flange and fuel tube (bank 1).

2.

Install fuel feed damper.

1

: Fuel tube (bank 2)

2

: Fuel tube (bank 1)

: Engine front

JPBIA2086ZZ

A

: Installed condition

B

: Clip mounting groove

C

: Protrusion

JPBIA2085ZZ

1

: Fuel damper cap

JPBIA2087ZZ

FUEL INJECTOR AND FUEL TUBE

EM-185

< REMOVAL AND INSTALLATION >

[VK50VE]

C

D

E

F

G

H

I

J

K

L

M

A

EM

N

P

O

• Handling procedure of O-ring is the same as that of fuel damper.
• Insert fuel feed damper straight into fuel tube (bank 2).

CAUTION:

Insert fuel feed damper at 147 N (15 kg, 33.1 lb) or less to prevent damage to the parts

• Tighten mounting bolts evenly in turn.
• After tightening mounting bolts, check that there is no gap between flange and fuel tube (bank 2).

3.

Install new O-rings to fuel injector paying attention to the following caution.

CAUTION:

• Upper and lower O-ring are different. Be careful not to confuse them.

• 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 O-ring straight into fuel injector. Never decenter or twist it.

4.

Install fuel injector (3) to fuel tube (1) as per the following:

a.

Insert clip (5) into clip mounting groove (B) on fuel injector.
• Insert clip so that protrusion (C) of fuel injector matches cutout

(E) of clip.

CAUTION:

• Never reuse clip. Replace it with a new one.
• Be careful to keep clip from interfering with O-ring. If

interference occurs, replace O-ring.

b.

Insert fuel injector into fuel tube with clip attached.
• Insert it while matching it to the axial center.
• Insert fuel injector so that protrusion (G) of fuel tube matches

cutout (F) of clip.

• Check that fuel tube flange (A) is securely fixed in flange fixing

groove (D) on clip.

CAUTION:

Insert fuel injector at 147 N (15 kg, 33.1 lb) or less to pre-
vent damage to the parts

c.

Check that installation is complete by checking that fuel injector
does not rotate or come off.
• Check that protrusions of fuel injectors and fuel tube are

aligned with cutouts of clips after installation.

5.

Install fuel tube and fuel injector assembly.
• Tighten mounting bolts (a) first. Then tighten mounting bolts

(b) shown in the figure.

CAUTION:

• Be careful not to let tip of injector nozzle come in contact with other parts.

Fuel tube side

: Black

Nozzle side

: Green

2

: O-ring (black)

4

: O-ring (green)

1

: Fuel tube (bank 2)

2

: Fuel tube (bank 1)

: Engine front

 1st step

: 10.1 N·m (1.0 kg-m, 7 ft-lb)

 2nd step

: 23.6 N·m (2.4 kg-m, 17 ft-lb)

JPBIA2095ZZ

JPBIA2086ZZ

EM-186

< REMOVAL AND INSTALLATION >

[VK50VE]

FUEL INJECTOR AND FUEL TUBE

• Insert fuel injector at 147 N (15 kg, 33.1 lb) or less to prevent damage to the parts

6.

Install quick connecters as per the following:
• Unless otherwise indicated, the installation to the engine side and centralized under-floor piping side is

exactly alike.

a.

Check no foreign substances are deposited in and around fuel piping and quick connector, and no dam-
age on them.

b.

Thinly apply new engine oil around fuel piping from tip end to spool end.

c.

Align center to insert quick connector straightly into fuel piping.

Fuel hose (center) and centralized under-floor piping side:

• Visually confirm that the two retainer tabs (A) are connected to

the quick connector (B).

CAUTION:

• 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.

Fuel feed damper side:

• Insert quick connector to fuel feed damper piping until top

spool (2) is completely inside quick connector and 2nd level
spool (3) exposes just below quick connector.

CAUTION:

• Hold (A) position as shown in the figure when inserting

fuel feed hose (1) 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.

d.

Pull quick connector by hand holding position (A). Check it is
completely engaged (connected) so that it does not come out
from fuel piping (1).

JPBIA2378ZZ

B

: Fitted condition

: Upright insertion

JPBIA0275ZZ

PBIC3795E

FUEL INJECTOR AND FUEL TUBE

EM-187

< REMOVAL AND INSTALLATION >

[VK50VE]

C

D

E

F

G

H

I

J

K

L

M

A

EM

N

P

O

e.

Install quick connector cap (3) to quick connector connection.

• Install quick connector cap with arrow (A) on surface facing

the direction of quick connector.

CAUTION:

If cap cannot be installed smoothly, quick connector may
have not be installed correctly. Check connection again.
NOTE:
Figure shows an example fuel feed damper side.

7.

Install in the reverse order of removal.

Inspection

INFOID:0000000005245230

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.

CAUTION:

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

1

: Fuel tube (bank 1)

2

: Fuel hose (center)

JPBIA2379ZZ