Grand Cherokee 2WD V6-3.7L (2008)
Fuel Pressure Release: Service and Repair
FUEL SYSTEM PRESSURE RELEASE
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) (1). For location of relay, refer to label on underside of PDC cover (1).
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.
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. Connect one end of a second jumper wire to remaining injector terminal.
CAUTION: Powering an injector for more than a few seconds will permanently damage the injector.
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. See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Line Coupler/Service and Repair.
13. Return fuel pump relay to PDC.
14. One or more Diagnostic Trouble Codes (DTC's) may have been stored in PCM memory due to fuel pump relay removal. A diagnostic scan tool
must be used to erase a DTC.