How to Relieve Fuel System Pressure on Jeep

Jeep Cherokee Fuel pressure Relieving procedure

Before replacing or disconnecting fuel system assembly parts its advisable to first relieve fuel pressure.

  • Use following procedure if the fuel injector rail is, or is not equipped with a fuel pressure test port.
The procedure starts here:-----

  1. Remove fuel fill cap.
  2. Remove fuel pump relay from Power Distribution Center (PDC). For location of relay, refer to label on underside of PDC cover.
  3. Start and run engine until it stalls.
  4. Attempt restarting engine until it will no longer run.
  5. Turn ignition key to OFF position. 

See below fuel pump details and image :----

fuel tank and fuel pump module

Steps 1, 2, 3 and 4 must be performed to relieve high pressure fuel from within fuel rail. Do not attempt to use following steps to relieve this pressure as excessive fuel will be forced into a cylinder chamber.

  1. Unplug connector from any fuel injector.
  2. Attach one end of a jumper wire with alligator clips (18 gauge or smaller) to either injector terminal.
  3. Connect other end of jumper wire to positive side of battery.
  4. Connect one end of a second jumper wire to remaining injector terminal. 
Powering an injector for more than a few seconds will permanently damage the injector.

  1. Momentarily touch other end of jumper wire to negative terminal of battery for no more than a few seconds.
  2. Place a rag or towel below fuel line quick-connect fitting at fuel rail.
  3. Disconnect quick-connect fitting at fuel rail.
  4. Return fuel pump relay to PDC.
  5. One or more Diagnostic Trouble Codes (DTCs) may have been stored in PCM memory due to fuel pump relay removal. The DRB scan tool must be used to erase a DTC.

These details will help.

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