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Home >> Dodge and Ram >> 2003 >> Durango Base, 5.9 Z, 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 5.9L >> Fuel System Pressure Release
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Fuel System Pressure Release

WARNING: Service vehicles in well ventilated areas and avoid ignition sources. NEVER smoke while servicing ANY vehicles fuel components.
CAUTION: Fuel system is under high pressure. Pressure is normally between 47.2-51.2 psi. Release fuel pressure before disconnecting any fuel lines or fuel system components.
CAUTION: When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery.
CAUTION: Steps 1-4 must be performed to relieve high pressure fuel from within fuel rail. Do not attempt to use steps 6-14 to relieve this pressure as excessive fuel will be forced into a cylinder chamber.
NOTE: Use following procedure if the fuel Injector rail is or is not equipped with a fuel pressure test port.
  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.
    6. CAUTION: 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.
  6. Unplug connector from any fuel injector.
  7. Attach one end of a jumper wire with alligator clips (18 gauge or smaller) to either injector terminal.
  8. Connect other end of jumper wire to positive side of battery.
    9. CAUTION: Powering an injector for more than a few seconds will permanently damage the injector.
  9. Connect one end of a second jumper wire to remaining injector terminal.
  10. Momentarily touch other end of jumper wire to negative terminal of battery for no more than a few seconds.
  11. Place a rag or towel below fuel line quick connect fitting at fuel rail.
  12. Disconnect quick connect fitting at fuel rail.
  13. Return fuel pump relay to PDC.
  14. One or more Diagnostic Trouble Codes (DTCs) may have been stored in PCM memory due to fuel pump relay removal. The DRBIII® scan tool must be used to erase a DTC. For clearing DTCs from PCM, see CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM.
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