Infiniti Q45. Manual - part 554

FUEL INJECTOR AND FUEL TUBE

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3.

Disconnect fuel feed hose on engine side with the following:
(Excepting to confirm whether or not there is quick connector
cap, perform same procedure for the side of centralized under-
floor piping as well.)

a.

Remove quick connector cap from quick connector connection.
(engine side only)

b.

Disconnect quick connector from fuel tube (fuel feed damper) with the following:

CAUTION:

Disconnect quick connector by using the quick connector release (SST: J-45488), not by picking
out retainer tabs (centralized under-floor piping side).

i.

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

ii.

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

CAUTION:

Inserting the quick connector release hard will not discon-
nect quick connector. Hold the quick connector release
where it contacts and goes no further.

iii.

Draw and pull out quick connector straight from fuel tube.

CAUTION:

●

Pull quick connector holding “A” position as shown in
the figure.

●

Do not pull with lateral force applied. O-ring inside quick connector may be damaged.

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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.

●

Do not expose parts to battery electrolyte or other acids.

●

Do not bend or twist connection between quick connector and fuel feed hose during installa-
tion/removal.

SBIA0353E

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KBIA0702E

EM-34

FUEL INJECTOR AND FUEL TUBE

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To keep clean the connecting portion and to avoid dam-
age and foreign materials, cover them completely with
plastic bags or something similar.

4.

Disconnect fuel damper and fuel hose assembly from fuel tubes (right and left).

CAUTION:

●

While hoses are disconnected, plug them to prevent fuel from draining.

●

Do not separate fuel damper and fuel hose assembly.

5.

Remove intake manifold (upper) with power tool. Refer to 

EM-19, "Removal and Installation"

 .

6.

Disconnect fuel injector sub harness connector from fuel injector.

7.

Loosen mounting bolts “2” to “1” as shown in the figure, and
remove fuel tube and fuel injector assembly.

CAUTION:

●

When removing, be careful to avoid any interference with
fuel injector.

●

Use a shop cloth to absorb any fuel leaks from fuel tube.

8.

Remove spacers on intake manifold (lower).

9.

Remove fuel injector from fuel tube with the following:

a.

Open and remove clip.

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.

●

Do not bump or drop fuel injectors.

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Do not disassemble fuel injectors.

10. Remove fuel damper (right) and fuel feed damper.

INSTALLATION

1.

Install fuel damper (right) and fuel feed damper.

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FUEL INJECTOR AND FUEL TUBE

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When handling O-rings, be careful of the following:

CAUTION:

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Handle O-ring with bare hands. Do not wear gloves.

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Lubricate O-ring with new engine oil.

●

Do not clean O-ring with solvent.

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Make sure that O-ring and its mating part are free of foreign material.

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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, do not insert it
quickly into fuel tube.

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Insert O-ring straight into fuel tube. Do not decenter or twist it.

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Insert fuel damper (right) and fuel feed damper straight into fuel tube (right).

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Tighten mounting bolts evenly in turn.

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After tightening mounting bolts, make sure that there is no gap between flange and fuel tube (right).

2.

Install O-rings to fuel injector paying attention to the items below.

CAUTION:

●

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

●

Handle O-ring with bare hands. Do not wear gloves.

●

Lubricate O-ring with new engine oil.

●

Do not clean O-ring with solvent.

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Make sure 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, do not insert it
quickly into fuel tube.

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Insert O-ring straight into fuel tube. Do not decenter or twist it.

3.

Install fuel injector to fuel tube with the following:

a.

Insert clip into clip mounting groove on fuel injector.

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Insert clip so that lug “A” of fuel injector matches notch “A” of
the clip.

CAUTION:

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Do not reuse clip. Replace it with a new one.

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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.

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Insert it while matching it to the axial center.

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Insert fuel injector so that lug “B” of fuel tube matches notch
“B” of the clip.

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Make sure that fuel tube flange is securely fixed in flange fix-
ing groove on clip.

c.

Make sure that installation is complete by making sure that fuel
injector does not rotate or come off.

●

Make sure that protrusions of fuel injectors are aligned with
notch of clips after installation.

4.

Install spacers on intake manifold (lower).

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

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EM-36

FUEL INJECTOR AND FUEL TUBE

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Tighten mounting bolts “1” to “2” as shown in the figure and in
two steps.

6.

Connect fuel feed hose on engine side with the following: (Excepting to confirm whether or not there is
quick connector cap, perform same procedure for the side of centralized under-floor piping as well.)

a.

Make sure no foreign substances are deposited in and around fuel tube (fuel feed damper) and quick con-
nector, and no damage on them. 

b.

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

c.

Align center to insert quick connector straightly into fuel tube.

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Insert fuel tube into quick connector until top spool is com-
pletely inside quick connector, and 2nd level spool exposes
right below quick connector.

CAUTION:

●

Hold “A” position as shown 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.

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Insert until you hear a “click” sound and actually feel the
engagement.

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

d.

Pull quick connector by hand holding “A” position. Make sure it is completely engaged (connected) so that
it does not come out from fuel tube.

e.

Install quick connector cap on quick connector connection. (on
engine side only).

f.

Install fuel feed hose to hose clamps.

7.

Install in the reverse order of removal.

INSPECTION AFTER INSTALLATION
Check on Fuel Leakage

1.

Turn ignition switch “ON” (with engine stopped). With fuel pressure applied to fuel piping, check for fuel
leakage at connection points.

NOTE:
Use mirrors for checking at points out of clear sight.

2.

Start engine. With engine speed increased, check again for fuel leakage at connection points.

CAUTION:

Do not touch engine immediately after stopped, as engine becomes extremely hot.

 1st step

: 10.1 N·m (1.0 kg-m, 7 ft-lb)

 2nd step

: 23.5 N·m (2.4 kg-m, 17 ft-lb)

PBIC2338E

KBIA0272E

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