Nissan Pick-ups and Pathfinder 1970-1988

Electric Fuel Pump

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OPERATION



See Figures 1, 2 and 3

1977-83-Models with A/C

1979-83-Cab/Chassis Models 1984-86-All Models

An electric fuel pump is used on these models. The pump is mounted on a bracket located on the right frame rail next to the fuel tank. There is a filter mounted in the body of the pump, which does not normally require service. The pump can be disassembled, if necessary, but all electronic parts within the body (one transistor, two diodes, and three resistors) must be replaced.



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Fig. Fig. 1: Exploded view of the electric fuel pump



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Fig. Fig. 2: Removing the filter on the electric fuel pump



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Fig. Fig. 3: The electric fuel pump is located on the right frame rail

REMOVAL & INSTALLATION



See Figures 4, 5, 6, 7 and 8

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the fuel pump protector.
  4.  
  5. Remove the inlet and outlet hoses, catching the fuel that escapes in a metal container.
  6.  
  7. Disconnect the wiring harness at the connector.
  8.  
  9. Remove the two bolts securing the pump to the bracket and remove the pump.
  10.  

To install:
  1. Unscrew the pump end cover and slide out the pump filter. Check that the filter is not clogged and then replace it.
  2.  
  3. Install the pump in the bracket and tighten the mounting screws.
  4.  
  5. Connect the wiring harness and the fuel lines.
  6.  
  7. Install the pump protector and reconnect the battery cable. Run the engine and check for leaks.
  8.  



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Fig. Fig. 4: View of the electric fuel pump assembly



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Fig. Fig. 5: Removing the electric fuel pump electrical connection



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Fig. Fig. 6: View of the gas line clamp - note the fuel inlet hose pinched off



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Fig. Fig. 7: Removing the gas hose clamp from the electric fuel pump



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Fig. Fig. 8: Removing the electric fuel pump from the frame rail

TESTING



See Figures 9, 10, 11, 12, 13, 14, 15, 16 and 17

  1. Disconnect the hose from the pump outlet at the pump.
  2.  
  3. Connect a length of hose to the outlet. The hose should have an inside diameter of 6mm (0.24 in.). The diameter of the hose is important for accurate measurements.
  4.  
  5. Raise the end of the hose above the level of the pump. Turn the ignition switch on and catch the gasoline in a graduated container. Pump output should be 1400cc in one minute or less.
  6.  
  7. Fuel pump pressure should be 4.6 psi through 1978, 3.1-3.8 psi for 1979-83 and 2.7-3.4 psi for 1984-86 models.
  8.  



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Fig. Fig. 9: View of the fuel pump protector installed



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Fig. Fig. 10: Cleaning the fuel pump cover assembly



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Fig. Fig. 11: Brushing off the fuel pump cover assembly



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Fig. Fig. 12: Removing the fuel pump cover



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Fig. Fig. 13: Removing the fuel pump filter



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Fig. Fig. 14: View of the fuel pump filter and cover



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Fig. Fig. 15: Removing the fuel pump cover gasket



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Fig. Fig. 16: View of the fuel pump cover gasket and magnet



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Fig. Fig. 17: Removing the fuel pump cover magnet

 
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