Mazda Trucks 1987-1993 Repair Guide

Electric Fuel Pump

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TESTING



See Figures 1 and 2

  1. Turn the ignition switch OFF and disconnect the negative battery cable.
  2.  
  3. Disconnect the main fuel hose and connect a pressure gauge to it.
  4.  



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Fig. Fig. 1: Connect a fuel pressure gauge to the main fuel hose (A)



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Fig. Fig. 2: Connect a jumper wire between terminals B and D of the fuel pump control unit

  1. Connect the negative battery cable. Connect a jumper wire between the B and D terminals of the fuel pump control unit.
  2.  
  3. Turn the ignition switch ON and check the fuel pressure. It should be 2.8-3.6 psi.
  4.  
  5. If the fuel pressure is not as specified, replace the fuel pump.
  6.  
  7. Turn the ignition switch OFF and disconnect the negative battery cable.
  8.  
  9. Remove the fuel pressure gauge and reconnect the main fuel hose. Remove the jumper wire from the fuel pump control unit.
  10.  
  11. Connect the negative battery cable.
  12.  

The fuel pump is located inside the fuel tank, attached to the tank sending unit assembly.

REMOVAL & INSTALLATION



See Figure 3



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Fig. Fig. 3: The electric fuel is mounted on the fuel gauge assembly which is located in the fuel tank

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the fuel tank.
  4.  
  5. Remove any dirt that has accumulated around the sending unit/fuel pump assembly so it will not enter the fuel tank during removal and installation.
  6.  
  7. Remove the attaching screws and remove the sending unit/fuel pump assembly.
  8.  
  9. If necessary, disconnect the electrical connectors and the fuel hose and remove the pump from the sending unit assembly.
  10.  
  11. Installation is the reverse of the removal procedure. Be sure to install a new seal rubber gasket.
  12.  

 
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