Chrysler Full-Size Trucks 1967-1988 Repair Guide

Relieving Fuel System Pressure

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CAUTION
The fuel injection system is under a constant pressure of approximately 14.5 psi (100 kPa). Before servicing any part of the fuel injection system, the system pressure must be released. Use a clean shop towel to catch any fuel spray and take precautions to avoid the risk of fire.

  1. Disconnect the negative battery cable.
  2.  
  3. Loosen the gas cap to release tank pressure.
  4.  
  5. Remove the wiring harness connector from the injector.
  6.  
  7. Ground one terminal of the injector.
  8.  
  9. Connect a jumper wire to the second terminal and touch the battery positive post for no longer than ten seconds. This releases system pressure.
  10.  
  11. Remove the jumper wire and continue fuel system service.
  12.  

 
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