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Fuel System Pressure Release

CAUTION: Fuel system is under high pressure. Release fuel pressure before disconnecting any fuel lines or fuel system components.
  1. Remove fuel tank cap. Remove fuel pump relay from Power Distribution Center (PDC). Start engine and allow engine to idle until engine stalls. Attempt to start engine until it will no longer run. Turn ignition off.
    2. CAUTION: Ensure previous step is performed to release high fuel pressure in the fuel rail before proceeding. DO NOT attempt to use the following steps to release fuel pressure unless previous step has been performed, as excessive fuel will be released into the cylinder.
  2. Disconnect harness connector at any fuel injector. Connect jumper wire between positive battery terminal and Automatic Shutdown (ASD) relay output circuit at fuel injector harness connector.
    3. CAUTION: DO NOT apply voltage to fuel injector for extended time or fuel injector may be damaged.
  3. Momentarily connect jumper wire between negative battery terminal and remaining fuel injector harness terminal for a few seconds. This operates fuel injector and releases fuel pressure.
  4. Remove jumper wires. Install harness connector on fuel injector. Fuel pressure should now be released. Reinstall fuel pump relay. Diagnostic Trouble Code (DTC) may have been stored in Powertrain Control Module (PCM) due to the removal of fuel pump relay. For clearing DTCs from PCM, see CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM.
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