GM S-Series Pick-ups and SUV's 1994-1999 Repair Guide

Electric Fuel Pump

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The electric pump is attached to the fuel sending unit, located in the fuel tank.

TESTING



See Figures 1 through 5

  1. Properly relieve the fuel system pressure.
  2.  
  3. Leave the gauge attached to the pressure fitting on the fuel inlet pipe.
  4.  
  5. If disconnected during the fuel pressure relief procedure, reconnect the negative battery terminal.
  6.  
  7. Turn the ignition ON and listen for the pump to run (is should run for 2 seconds). If necessary, cycle the ignition OFF for 10 seconds and then ON again in order to build maximum system pressure. Check that pressure is at specification:
    1. Note the fuel pressure with the pump RUNNING, it should be 41-47 psi (284-325 kPa). When the pump stops pressure may vary slightly, then should hold steady. If not, refer to the accompanying fuel system diagnosis charts.
    2.  

  8.  



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Fig. Fig. 1: Typical fuel pump relay circuit



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Fig. Fig. 2: Common fuel pump circuit



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Fig. Fig. 3: Fuel Pump Relay Circuit Diagnosis 2.2L Pickup



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Fig. Fig. 4: Fuel System Diagnosis 2.2L MFI (VIN 4)



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Fig. Fig. 5: Fuel System Diagnosis 2.2L MFI (VIN 4)

REMOVAL & INSTALLATION



Removal and installation of the fuel pump and sending unit assembly is the same on MFI/SFI vehicles as it is for TBI vehicles. Please refer to the TBI procedures earlier in this section for electric fuel pump replacement.

 
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