Nissan Maxima. Manual - part 664

FUEL SYSTEM

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PERIODIC MAINTENANCE

FUEL SYSTEM

Inspection

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Inspect fuel lines, fuel filler cap and fuel tank for improper attach-

ment, leaks, cracks, damage, loose connections, chafing or deterio-

ration.

If necessary, repair or replace damaged parts.

Quick Connector

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CAUTION:

• After connecting fuel tube quick connectors, make sure quick

connectors are secure.

• Ensure that connector and resin tube do not contact any adja-

cent parts.

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FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY

REMOVAL AND INSTALLATION

FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY

Exploded View

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Removal and Installation

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WARNING:

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

GI-27, "General Precautions"

.

NOTE:

When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spill-

ing.

REMOVAL

1. Unscrew the fuel filler cap to release the pressure inside the fuel tank.
2. Release the fuel pressure from the fuel lines. Refer to 

EC-592, "Inspection"

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3. Disconnect the battery negative terminal. Refer to 

PG-67, "Removal and Installation (Battery)"

.

1.

Lock ring

2.

Fuel level sensor, fuel filter and fuel 
pump assembly

3.

O-ring

4.

Fuel tank

Front

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FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY

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4. Remove the rear seat cushion. Refer to 

SE-70, "Removal and Installation"

 (with fixed seatback, WITH

CLIMATE CONTROLLED SEATS), 

SE-73, "Removal and Installation"

 (with split seatback, WITH CLI-

MATE CONTROLLED SEATS), 

SE-128, "Removal and Installation"

 (with fixed seatback, W/O CLIMATE

CONTROLLED SEATS) 

SE-131, "Removal and Installation"

 (with split seatback, W/O CLIMATE CON-

TROLLED SEATS).

5. Turn the four retainers 90 degrees in a clockwise direction and

remove the fuel pump inspection hole cover.

6. Disconnect the fuel level sensor, fuel filter, and fuel pump

assembly harness connector, EVAP hose quick connector, and

the fuel feed hose quick connector from the fuel level sensor

unit, fuel filter, and fuel pump assembly.

Remove the quick connector as follows:

• Hold the sides of the connector, push in tabs and pull out the

tube.

• If the connector and the tube are stuck together, push and pull

several times until they start to move. Then disconnect them

by pulling.

CAUTION:

• The tube can be removed when the tabs are completely

depressed. Do not twist it more than necessary.

• Do not use any tools to remove the quick connector.

• Keep the resin tube away from heat. Be especially careful

when welding near the tube.

• Prevent acid liquid such as battery electrolyte, etc. from getting on the resin tube.

• Do not bend or twist the tube during installation and removal.

• Only when the tube is replaced, remove the remaining retainer on the tube or fuel level sensor,

fuel filter, and fuel pump assembly.

• When the tube or fuel level sensor, fuel filter, and fuel pump assembly is replaced, also replace

the retainer with a new one (green colored retainer).

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

age and foreign materials, cover them completely with

plastic bags or something similar.      

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FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY

7. Remove the lock ring using a socket drive handle and Tool as

shown.

CAUTION:

Discard the lock ring if damaged or distorted.

8. Remove the fuel level sensor, fuel filter, and fuel pump assembly

and O-ring. Discard the O-ring.

CAUTION:

• Do not bend the float arm during removal. 

• Do not reuse the O-ring.

INSPECTION AFTER REMOVAL

Inspect the fuel level sensor, fuel filter, and fuel pump for any defects and foreign materials. Replace as neces-

sary.

INSTALLATION

Installation is in the reverse order of removal.

• Install the fuel level sensor, fuel filter, and fuel pump assembly with

the fuel feed hose facing the front of the vehicle as shown. Use a

new O-ring.

CAUTION:

Do not reuse O-ring.

• Connect the quick connector as follows:

- Check the connection for damage or any foreign materials.

- Align the connector with the tube, then insert the connector straight

into the tube until a click is heard.

• After the tube is connected, make sure the connection is secure by

performing the following checks:

- Pull the tube and the connector to make sure they are securely

connected.

Tool number

: KV991J0090 (J-46214) (shown)
: KV101207S0 ( — )

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