Fuel pressure relief procedure
2007 models
1. Disconnect the cable from the negative terminal of the battery (see Engine electrical systems).
2. Locate the Schrader valve test port on the left (driver’s) end of the fuel rail for the front cylinder bank.
3. Connect a fuel pressure gauge (equipped with a bleed-off hose) to the Schrader valve.
4. Direct the bleed-off hose into an approved fuel container, then open the bleed-off valve. When the flow of fuel ceases, the pressure is relieved.
2008 through 2010 models
5. Disconnect the electrical connector from the fuel pump inertia switch (see illustration 2.2).
6. Start the engine an allow it to run until it dies.
7. After the engine stalls, crank it over for a few more seconds to make sure the pressure has been relieved.
8. Disconnect the cable from the negative terminal of the battery before working on the fuel system (see Engine electrical systems).
2011 and later models
9. Raise the rear of the vehicle and support it securely on jack stands. Remove the undivided panel from in front of the left rear wheel.
10. Disconnect the Fuel Pump Control Module (FPCM) electrical connector (see illustration).
3.10 Disconnect the Fuel Pump Control Module (FPCM) electrical connector (2011 and later models)
11. Start the engine and allow to idle until the engine stalls, then crank the engine a few times to make sure all the pressure is released.
12. Disconnect the cable from the negative terminal of the battery before working on the fuel system (see Engine electrical systems).
Warning: The fuel pressure is relieved on the low-pressure side of the system, but pressure will still remain in the high-pressure side of the system. Before loosening any connections on the high-pressure side of the system, wait at least two hours. Then release the fuel pressure from the high-pressure fuel pump prior to disconnecting any fuel lines in the delivery or low-pressure system (see Steps 13 and 15).
High pressure fuel pump pressure release (turbocharged models only)
13. Relieve the fuel system pressure (see Steps 9 through 12).
14. Place a flare nut wrench on the high-pressure fuel tube (see illustration), then wrap the wrench and nut with a shop towel to absorb any remaining fuel pressure while loosening the nut.
3.14 Loosen the high-pressure fuel tube with a flare-nut wrench while covering it with a shop towel
