Fuel System Pressure Release

WARNING: Always release fuel pressure before disconnecting any fuel injection-related component. DO NOT allow fuel to contact engine or electrical components.

Remove fuel cap from fuel tank. Ensure all pressure is released from fuel tank.
Remove fuel pump relay from engine compartment Power Distribution Center (PDC). Fuel pump relay may be identified by label on inside of PDC cover. See POWER DISTRIBUTION CENTER (PDC) LOCATION table under MOTORS, RELAYS & SOLENOIDS.
Start engine and allow engine to idle until engine stalls. Attempt to restart engine until engine will no longer run. Turn ignition off.
CAUTION: Ensure steps 1 through 3 are performed before proceeding. Steps 2 and 3 must be performed to ensure most of fuel pressure is released from fuel rails to prevent an excessive amount of fuel being delivered into cylinders.
Remaining fuel pressure is released by energizing a fuel injector. Disconnect electrical connector at any fuel injector. Connect jumper wire between one electrical terminal on fuel injector and positive battery terminal.
CAUTION: DO NOT apply battery voltage to fuel injector for more than a few seconds or fuel injector may be damaged.
Connect another jumper wire on remaining electrical terminal on fuel injector. Momentarily touch remaining end of jumper wire to negative battery terminal in short intervals to energize fuel injector and release remaining fuel pressure.
Remove jumper wires. Reinstall electrical connector and fuel pump relay. Fuel system components may now be serviced. Cover fuel lines with shop towel before disconnecting, as some residual fuel pressure may exist.
Diagnostic Trouble Code (DTCs) may be stored in Powertrain Control Module (PCM) due to removal of fuel pump relay. Using scan tool, clear DTCs from PCM. See appropriate JEEP SELF-DIAGNOSTICS article for clearing of DTCs.