Nissan Sentra/Pulsar/NX 1982-1996 Repair Guide

Electric Fuel Pump

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All fuel injected models use an in-tank type pump. The fuel pumps are of a wet type, where the vane rollers are directly coupled to the motor, which is filled with fuel. A relief valve in the pump is designed to open, should a malfunction arise in the system.

Before disconnecting the fuel lines or any of the fuel system components, refer toFuel Pressure Release proceduresin this section, and release the fuel pressure.

REMOVAL & INSTALLATION




CAUTION
Fuel injection systems remain under pressure after the engine has been turned OFF. Properly relieve fuel pressure before disconnecting any fuel lines. Also observe all safety practices outlined earlier in the Fuel System Safety Precautions. Failure to do so may result in fire or personal injury.

E15ET Engine

The 1984 Pulsar uses an in-tank fuel pump assembly which is similar to the one used on the Throttle Body Fuel Injected vehicles. Refer to the procedure outlined for those vehicles, in the Throttle Body Fuel injection portion of this section.

GA16DE and SR20DE Engines

See Figures 1, 2, 3, 4, 5 and 6



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Fig. Fig. 1: Inspection cover identification-1991-94 vehicles



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Fig. Fig. 2: Inspection cover identification-1995-96 vehicles



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Fig. Fig. 3: Fuel pump/sender module external connection points



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Fig. Fig. 4: Fuel pump/sender module internal connection points



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Fig. Fig. 5: Removing the fuel pump from the chamber assembly-1995-96 vehicles



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Fig. Fig. 6: Removing the fuel pump from the chamber assembly-1991-94 vehicles

This procedure should be done with a half tank or less. Fuel may spill out of the fuel pump/sender opening when removed.

  1. Following proper procedures, relieve fuel system residual pressure.
  2.  
  3. Disconnect the negative battery cable and relieve the fuel pressure.
  4.  
  5. Remove the rear seat and inspection hole cover located beneath the rear seat.
  6.  
  7. Disconnect the fuel supply hose, fuel return hose and wiring harness connections.
  8.  
  9. Remove the 6 retaining screws and lift the fuel module assembly from the tank.
  10.  
  11. On 1991-94 vehicles, remove the fuel pump from the chamber assembly as follows:
    1. Pull up on the top (connection end) of the pump.
    2.  
    3. Slide the pump out of the chamber assembly.
    4.  

  12.  
  13. On 1995-96 vehicles, remove the fuel pump from the chamber assembly as follows:
    1. Pull up the front of the fuel pump chamber and slide the chamber cover toward the top (connection end) of the pump.
    2.  
    3. Remove the fuel pump from the chamber.
    4.  

  14.  

To install:
  1. Install the fuel pump into the chamber assembly.
  2.  
  3. Install the 6 retaining screws and torque as follows:

    1991-94 vehicles-26-35 inch lbs. (3.2-4.2 Nm).
     
    1995-96 vehicles-17-22 inch lbs. (2.0-2.5 Nm).
     

  4.  
  5. Connect the fuel lines and the wiring harness.
  6.  
  7. Install the inspection hole cover located beneath the rear seat and seat.
  8.  
  9. Connect the negative battery cable, turn the ignition ON and check for leaks.
  10.  

TESTING



See Figures 7 and 8



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Fig. Fig. 7: Typical fuel gauge connection



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Fig. Fig. 8: The fuel gauge should be connected in series with this hose

  1. Properly release the fuel system residual pressure.
  2.  
  3. Disconnect the fuel hose from between the fuel filter and the fuel rail.
  4.  

Make the connection in series with the fuel filter line leading to the engine.

  1. Install fuel pressure Gauge J-25400-34 or equivalent, between the metal pipe and the fuel filter hose. Place the gauge, so it can be read from the driver's seat.
  2.  
  3. Start the engine and read the fuel pressure, it should be as follows:

    E15ET Turbo-30 psi (206.85 kPa) at idle
     
    E15ET Turbo-37 psi (255 kPa) engine accelerated
     
    GA16DE and SR20DE-36.0 psi (248.2 kPa) with the regulator vacuum hose connected
     
    GA16DE and SR20DE-43.0 psi (296.5 kPa) with the regulator vacuum hose disconnected
     

  4.  

If the reading is not correct, check the pressure regulator, fuel pump, fuel filter. Also check for clogged or damaged fuel pressure and return lines; if necessary, replace the faulty component(s) and retest.

 
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