Fuel System Pressure Release

Fig 1: Identifying Power Distribution Center & Integrated Power Module

Courtesy of DAIMLERCHRYSLER CORP.

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). See Fig 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. (Refer to FUEL SYSTEM/FUEL DELIVERY/QUICK CONNECT FITTING - STANDARD PROCEDURE) .
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.