GM Prizm/Nova 1985-1993 Repair Guide

Relieving Fuel System Pressure

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CAUTION
To reduce the risk of fire and personal injury, it is necessary to release the fuel system pressure before servicing any fuel system components.

1988-92
  1. Remove the fuel cap to remove fuel tank pressure.
  2.  
  3. Disconnect the circuit opening relay located under the dash near the ECM.
  4.  
  5. Crank the engine and allow it to run until it stalls, then crank for an additional 30 seconds.
  6.  
  7. Disconnect the negative battery cable to prevent accidental cranking of the engine.
  8.  
  9. Use a shop towel to catch any fuel and slowly loosen and remove the cold start injector valve line bolt at the fuel rail.
  10.  

1993

See Figure 1

  1. Remove the fuel cap to remove fuel tank pressure.
  2.  
  3. Disconnect the circuit opening relay as follows:
    1. Remove the radio as outlined in Chassis Electrical .
    2.  
    3. Disconnect the circuit opening relay electrical connector from the center console.
    4.  

  4.  
  5. Crank the engine and allow it to run until it stalls, then crank for an additional 3 seconds.
  6.  
  7. Disconnect the negative battery cable to prevent accidental cranking of the engine and a discharge of fuel.
  8.  
  9. Reconnect the circuit opening relay.
  10.  
  11. Install the radio.
  12.  
  13. Install the fuel filler cap.
  14.  



Click image to see an enlarged view

Fig. Fig. 1: Circuit opening relay - 1993

 
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