### Fuel Pump

#### REMOVAL AND INSTALLATION

##### 1993-94 Sentra

CAUTION
Never smoke when working around gasoline! Avoid all sources of sparks or ignition. Gasoline vapors are EXTREMELY volatile!

The fuel pump is located in the fuel tank on all vehicles. In-tank fuel pumps are accessible either by lifting up the rear seat or through an opening (access or inspection cover) in the trunk compartment. If the vehicle has no fuel tank inspection cover, the fuel tank assembly must be lowered or removed to gain access to the in-tank fuel pump.

1. Relieve the fuel system pressure.
2. Disconnect the negative battery cable.
3. Disconnect the electrical connector and the fuel gauge connector. Remove the inspection cover.
4. Disconnect the inlet and outlet fuel lines from the fuel pump assembly. Remove the fuel tank if necessary.
5. Remove the locking ring or unbolt and remove the fuel pump from the top of the fuel tank.

   NOTE: When removing or installing the locking ring, be sure to use a brass drift pin to unseat or seat the ring.

6. Discard the O-ring seal or gasket.

   To install:

7. Install the pump with a new gasket or O-ring seal. Tighten the pump retaining bolts or seat locking ring and connect the fuel hoses. Be sure to use new clamps and verify that all hoses are properly seated on the fuel tank. If removed, install the fuel tank.
8. Reconnect the fuel gauge connector.
9. Install the fuel pump access cover.
10. Reconnect the pump wiring harness connector.
11. Reconnect the negative battery cable.
12. Start the engine and check for leaks.

    NOTE: On some models, the Check Engine Light will stay on after the repair is complete. The memory code in the ECU must be erased. To erase the code, disconnect the battery cables for 1 minute then reconnect.

##### 1995-97 Sentra and 200SX

The fuel pump is located in the fuel tank on all vehicles. In-tank fuel pumps are accessible by lifting up the rear seat to gain access to the inspection cover.

1. Relieve the fuel system pressure.
2. Disconnect the negative battery cable.
3. Remove the rear seat from the vehicle.
4. Remove the inspection cover that is located under the rear seat.
5. Disconnect the inlet and outlet fuel lines from the fuel pump assembly.
6. Disconnect the fuel pump and gauge wiring connections.
7. Remove the six mounting bolts that secure the fuel pump assembly to the top of the fuel tank.
8. Raise up the fuel pump assembly and disconnect the fuel tubes and connector. Remove the fuel gauge assembly.
9. Remove the fuel pump with the fuel chamber.
10. Pull up the front of the fuel pump chamber and slide the chamber forward.
11. Remove the fuel pump from the chamber.
12. Discard the O-ring seal or gasket.

    To install:

13. Install the fuel pump to the fuel pump chamber and slide chamber rearward.
14. Install the fuel pump with the fuel pump chamber.
15. Using a new O-ring, install the fuel gauge assembly and connect the fuel tubes and connector. Use new hoses and clamps.
16. Install the six mounting bolts to the top of the fuel gauge unit. Tighten the bolts to 28-37 inch lbs. (3-4 Nm).
17. Connect the fuel pump and gauge wiring connections.
18. Using new hoses and clamps, connect the inlet and outlet fuel lines to the fuel pump assembly.
19. Install the inspection cover and install the rear seat.
20. Connect the negative battery cable, start the engine, and check for leaks.

    NOTE: On some models, the Check Engine Light will stay on after the repair is complete. This is caused by an open fuel pump circuit when relieving the fuel pump pressure The memory code in the ECU must be erased. To erase the code, disconnect the battery cables for 1 minute then reconnect.

##### Altima

1. Relieve the pressure from the fuel system.
2. Disconnect the negative battery cable.
3. Remove the rear seat and remove the access cover.
4. Disconnect the fuel pump electrical connector.
5. Disconnect the fuel lines from the fuel pump assembly.
6. Remove the locking ring using special tool J38879 or equivalent.
7. Remove the fuel gauge assembly; disconnect the fuel tube and connector from the fuel gauge.

   NOTE: When the fuel sending unit needs to be removed, pull the tab upwards. The tab is located on the sending unit, opposite the end of the float. After the tab is pulled, the sending unit will lift straight out of the tank bracket.

8. Remove the fuel pump by pinching the two locking tabs together. Lift the fuel pump assembly straight upward and out of fuel tank.
9. Remove the O-ring and discard. Place a clean rag in the hole to keep out dirt.

   To install:

10. Remove the rag and install a new O-ring.
11. Install the fuel pump.
12. Connect the electrical connection and fuel tube to the fuel gauge sending unit.
13. Install the fuel sending unit into the tank.

    NOTE: Verify that the mark on the fuel tank and the components are aligned when installing the pump and fuel gauge sending unit.

14. Install the locking ring and tighten ring to 22-26 ft. lbs. (30-35 Nm).
15. Connect the fuel lines and fuel pump electrical connector. Always install new clamps on the fuel lines.
16. Install the fuel pump access cover.
17. Install the rear seat.
18. Connect the negative battery cable.
19. Start the engine and check for leaks.

##### Maxima, 300ZX and 240SX

1. Relieve the fuel system pressure
2. Disconnect the negative battery cable.
3. Remove the rear seat or open the access panel in the trunk.
4. Disconnect the fuel gauge electrical connector and pump electrical connector.
5. Disconnect the fuel outlet and the return hoses. If necessary, remove the fuel tank.
6. On some 240SX models you need to remove the fuel pump assembly-to-fuel tank bolts and lift the fuel pump assembly from the fuel tank.
7. On other models you need to remove the locking ring with tool SST J38879-A or equivalent and raise the fuel pump from the tank. Disconnect the feed tube while raising the pump.
8. Discard the O-ring. Plug the fuel tank opening with a clean rag to prevent dirt from entering the system.

   NOTE: When removing or installing the fuel pump assembly, be careful not to damage or deform it and always install a new O-ring.

   To install:

9. Remove the rag; using a new O-ring, install fuel pump assembly into the fuel tank.
10. Install the fuel pump assembly-to-fuel tank bolts and torque the bolts to 17-22 inch lbs. (2.0-2.5 Nm).
11. Install the locking ring assembly and tighten.
12. If removed, install the fuel tank assembly.
13. Connect the fuel lines and the electrical connectors. Always use new clamps when reconnecting fuel line hoses.

    NOTE: When installing the upper plate, be sure to align the mark with the center marks on the fuel tank.

14. Install the fuel pump access cover.
15. Connect the negative battery cable.
16. Start the engine and check for fuel leaks.

    NOTE: On some models, the Check Engine Light will stay ON after installation is completed. The memory code in the control unit must be erased. This code is stored for an open fuel pump circuit, this is caused when the fuel pressure is released. To erase the code, disconnect the battery cable for 10 seconds then reconnect after installation of fuel pump.