Mazda 323/626/929/GLC/MX-6/RX-7 1978-1989

Electric Fuel Pump

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Before starting this procedure, purchase a new connecting hose which runs between the pump outlet and the top of the pump/gauge assembly. This would also be an ideal time to replace the in-tank filter.

REMOVAL & INSTALLATION



See Figure 1


CAUTION
Before removing the fuel pump, release the fuel system pressure to prevent personal injury or fire hazard!

  1. Remove the rear seat cushion.
  2.  
  3. Relieve the fuel system pressure, then disconnect the negative battery cable.
  4.  
  5. Unfasten the attaching screws and remove the service hole cover.
  6.  
  7. Note the hookup locations of the fuel hoses. Disconnect the fuel supply and return hoses, then plug them to prevent system contamination. Unfasten the attaching screws and remove the pump/gauge unit assembly and gasket. If the gasket appears worn, replace it.
  8.  
  9. Unscrew and detach the electrical connector(s) for the pump from the assembly.
  10.  
  11. Loosen the screw at the clamp which holds the pump in position. Loosen the clamps and remove the hose connecting the outlet of the pump to the assembly. Remove the pump from the vehicle.
  12.  

To install:
  1. Install the pump into its mounting bracket and connect the fuel outlet hose to the pump. Secure the outlet hose with the clamps.
  2.  
  3. Support the pump by hand and install the retaining screw that holds the pump in place in the bracket. Attach the electrical connector(s) to the pump. Install the pump/gauge assembly and secure with the attaching screws.
  4.  
  5. Connect the fuel inlet and outlet lines to their respective connections. Physically check the fuel lines and the pump wiring to make sure that they are tight and in place. Use tie straps as required to secure the fuel hoses and the wiring.
  6.  
  7. Install the fuel pump cover and attach the connector to it. Install the rear seat cushion.
  8.  
  9. Connect the negative battery cable.
  10.  



Click image to see an enlarged view

Fig. Fig. 1: Exploded view of fuel pump assembly-323, 626 and MX-6

TESTING



  1. Disconnect the negative battery cable.
  2.  


CAUTION
Make sure the engine is cold. Otherwise, escaping fuel could start a fire!

  1. Cover the connection with a rag because the fuel is under pressure, then disconnect the fuel line at the discharge side of the pump. Connect a gauge directly to the discharge port.
  2.  
  3. Reconnect the battery.
  4.  
  5. On the 626, detach the fuel pump check connector, which is located on the firewall, and jumper the terminals. On 1988-89 626s and MX-6s, the connector is yellow and is located on the firewall near the washer/wiper motor.
  6.  
  7. On the 323, turn the ignition ON , then jumper the GW and B terminals of the fuel pump check connector. On 323s, the fuel pump check connector is located between the battery and the washer wiper pump.
  8.  
  9. Observe the reading on the pressure gauge. It should be 64-85 psi (441-586 kPa). If the wiring to the pump and its relay are good, replace the fuel pump.
  10.  

 
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