Infiniti FX35, FX50 (S51). Manual - part 935

EM-40

< REMOVAL AND INSTALLATION >

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FUEL INJECTOR AND FUEL TUBE

FUEL INJECTOR AND FUEL TUBE

Exploded View

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CAUTION:

Never remove or disassemble parts unless instructed as shown in the figure.

Removal and Installation

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REMOVAL

WARNING:

• Put a “CAUTION: FLAMMABLE” sign in the workshop.
• Be sure to work in a well ventilated area and furnish workshop with a CO

2

fire extinguisher.

• Never smoke while servicing fuel system. Keep open flames and sparks away from the work area.
• Never drain engine coolant when the engine is hot to avoid the danger of being scalded.

1.

Release fuel pressure. Refer to 

EC-566, "Inspection"

.

2.

Disconnect battery cable from the negative terminal. Refer to 

PG-161, "Exploded View"

.

3.

Remove engine cover with power tool. Refer to 

EM-27, "Exploded View"

.

4.

Remove air cleaner case and air duct. Refer to 

EM-29, "Exploded View"

.

1.

Quick connector cap

2.

Fuel feed hose (with damper)

3.

O-ring

4.

Fuel sub tube

5.

O-ring

6.

Fuel damper cap

7.

Fuel damper

8.

O-ring

9.

Fuel tube

10. Clip

11. O-ring (black)

12. Fuel injector

13. O-ring (green)

A.

Refer to 

EM-40

Refer to 

GI-4, "Components"

 for symbols in the figure.

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5.

Remove intake manifold collector. Refer to 

EM-31, "Exploded View"

.

6.

Remove fuel feed hose (with damper) (1) from fuel sub-tube (2)
and remove harness bracket (3).

NOTE:
There is no fuel return route.

CAUTION:

• While hoses are disconnected, plug them to prevent fuel

from draining.

• Never separate damper and hose.

7.

When separating fuel feed hose (with damper) and centralized under-floor piping connection, disconnect
quick connector as per the following:

a.

Remove quick connector cap (2) from quick connector connec-
tion on right member side.

b.

Disconnect fuel feed hose (with damper) (1) from bracket hose
clamp.

c.

Push in retainer tabs (2).

d.

Draw and pull out quick connector (1) straight from centralized
under-floor piping (3).

CAUTION:

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

figure.

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

connector may be damaged.

• Prepare container and cloth beforehand as 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.

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

age and foreign materials, cover them completely with
plastic bags, etc. (A) or something similar.

8.

Remove fuel sub tube mounting bolt.

9.

Disconnect harness connector from fuel injector.

: Engine front

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< REMOVAL AND INSTALLATION >

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FUEL INJECTOR AND FUEL TUBE

10. Loosen mounting bolts in reverse order as shown in the figure,

and remove fuel tube and fuel injector assembly.

CAUTION:

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

11. Remove fuel injector (2) from fuel tube (4) as per the following:

a.

Open and remove clip (1).

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.

12. Remove fuel sub-tube and fuel damper, if necessary.

INSTALLATION

1.

Install fuel damper (4) as per the following:

a.

Install new O-ring (2) to fuel tube (1) as shown. When handling
new O-ring, be careful of the following caution:

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 twist it.

b.

Install spacer (3) to fuel damper.

c.

Insert fuel damper straight into fuel tube.

CAUTION:

• Insert straight, checking sure 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 (B) is touching (A) of fuel tube.

d.

Tighten bolts evenly in turn.
• After tightening bolts, check that there is no gap between fuel

damper cap (5) and fuel tube.

2.

Install fuel sub-tube.
• When handling new O-rings, be careful of the following caution:

CAUTION:

• Handle O-ring with bare hands. Never wear gloves.
• Lubricate O-ring with new engine oil.

: Engine front

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: O-ring

A

: Installed condition

B

: Clip mounting groove

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• 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.

• Insert fuel sub-tube straight into fuel tube.
• Tighten mounting bolts evenly in turn.
• After tightening mounting bolts, check that there is no gap between flange and fuel tube.

3.

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

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 to fuel tube as per the following:

a.

Insert clip (3) into clip mounting groove (D) on fuel injector (5).

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

cutout (B) of clip.

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

groove (C) on clip.

c.

Check that installation is complete by checking that fuel injector
does not rotate or come off.
• Check that protrusions of fuel injectors are aligned with cut-

outs of clips after installation.

5.

Install fuel tube and fuel injector assembly to intake manifold.

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)

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