Nissan Quest E52. Manual - part 677

FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY

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REMOVAL AND INSTALLATION

FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY

Exploded View

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REMOVAL

DISASSEMBLY

Removal and Installation

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WARNING:

Read “General Precautions” when working on the fuel system. Refer to 

FL-2, "General Precautions"

.

REMOVAL

1.

Release the fuel pressure from the fuel lines. Refer to 

EC-141, "Work Procedure"

.

2.

Check fuel level on a level ground. If the fuel level is 7/8 of the fuel tank (full or nearly full), draw appropri-
ate amount of fuel from the fuel tank.

• In the event of malfunction in fuel pump, insert a hose measuring 20mm (0.79 in) in diameter into the

filler opening to draw approximately 20 liters fuel.

1.

Retainer

2.

Fuel level sensor unit, fuel filter and 
fuel pump assembly

3.

Seal packing

 : Always replace after every disassembly.

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1.

Fuel filter and fuel pump assembly

2.

Fuel level sensor unit

3.

Fuel tank temperature sensor

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Guideline

: Draw approximately 20 liters from a full-tank condition.

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FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY

3.

Open fuel filler lid.

4.

Open filler cap and release the pressure inside fuel tank.

5.

Slide the left second seat in the forward direction.

6.

Peel off floor carpet, then remove inspection hole cover units by turning clips clockwise by 90 degrees.

7.

Disconnect harness connector (1), fuel feed tube (3) and EVAP
hose (2).

Disconnect quick connector as follows:

• Hold the sides of connector, push in tabs (B) and pull out fuel

feed tube.

• If quick connector sticks to tube of main fuel level sensor unit,

push and pull quick connector several times until they start to
move. Then disconnect them by pulling.

CAUTION:

• Quick connector (1) can be disconnected when the tabs

(F) are completely depressed. Never twist it more than
necessary.

• Never use any tools to disconnected quick connector.
• Keep resin tube (C) away from heat. Be especially careful

when welding near the resin tube.

• Prevent acid liquid such as battery electrolyte, etc. from

getting on resin tube.

• Never bend or twist resin tube during installation and dis-

connection. 

• Never remove the remaining retainer (2) on hard tube (or

the equivalent) (A) except when resin tube or retainer is
replaced.

• When resin tube or hard tube (or the equivalent) is

replaced, also replace retainer with new one. 

4

: Quick connector

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A

:  Pull

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B

: Connection (cross-section)

D

: To under floor fuel line

E

: To fuel tank

G

: Disconnection

Retainer color: Green

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FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY

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

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

8.

Remove retainer for fuel level sensor unit, fuel filter and fuel
pump assembly with fuel tank lock ring wrench [SST:
KV10119900 (–)] (A) by turning counterclockwise.

CAUTION:

• To prevent lock ring wrench from being detached,

securely hold down spinner handle (B) by hand.

• To reduce impact caused by removal operation, use long

spinner handle [handle length: 60 cm (23.62 in) or more]
and slowly turn it counterclockwise.

9.

Pull up the fuel level sensor unit, fuel filter and fuel pump assem-
bly to the position shown in the figure.

CAUTION:

To prevent the transfer tube from becoming disconnected,
never pull the assembly more than necessary.

10. Disconnect transfer tube from the fuel level sensor unit, fuel filter

and fuel pump assembly by holding and pulling (A) of quick con-
nector in the direction shown by arrow.

CAUTION:

Never pull transfer tube because it is inseparable from the
fuel tank assembly.

11. Remove fuel level sensor unit, fuel filter and fuel pump assembly.

INSTALLATION

Note to the following, and install in the reverse order of removal.

Fuel Level Sensor Unit

1.

Install new seal packing to fuel tank without any twist.

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FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY

2.

Disconnect transfer tube placed in the fuel tank quick connector
as follows.
1.

Check the connection for damage or any foreign materials.

2.

Eliminate distortion from the transfer tube placed in the fuel
tank, referring to the figure.

3.

Align the connector with the tube, then insert the connector
straight into the tube until a click sound is heard.

4.

Pull the tube and the connector to check they are securely
connected.

3.

With the float of fuel level sensor unit, fuel filter and fuel pump
assembly positioned as shown in the figure, insert the fuel pump
assembly into the fuel tank. 

CAUTION:

Never bend float arm during installing.

4.

After the insertion, turn the fuel level sensor unit, fuel filter and
fuel pump assembly by 90 degrees in the direction shown by
arrow.

:Vehicle front

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:Vehicle front

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