Fuel Pressure Relief
Fuel that flows out at high pressure can cause serious injury to the skin and eyes. ALWAYS depressurize the fuel system before removing components that are under high fuel pressure.
Remove the fuel tank cap and relieve the fuel system pressure before servicing the fuel system in order to reduce the risk of personal injury. After you relieve the fuel system pressure, a small amount of fuel may be released when servicing the fuel lines, the fuel injection pump, or the connections. In order to reduce the risk of personal injury, cover the fuel system components with a shop towel before disconnection. This will catch any fuel that may leak out. Place the towel in an approved container when the disconnection is complete.
Scan Tool Method - Preferred
- Open the hood.
- Install a scan tool and turn the ignition ON.
- Using the scan tool, select the special function to relief fuel pressure and follow on screen prompts.
- Start the vehicle and allow the engine to idle until the engine stops. The engine will stop in approximately 5-20 seconds.
- Using the scan tool, verify pressure has dropped to a minimal level.
- Turn the ignition OFF.
Alternate Method - If a scan tool is not available
- Open the hood.
- Disable the fuel pump by removing the B+ fuel pump control module fuse. Refer to Electrical Center Identification Views .
- Start the vehicle and allow the engine to idle until the engine stops. The engine will stop in approximately 5-20 seconds.
- Turn the ignition OFF.
Metallic rattle noise may be heard during fuel pressure relief. If engine does not stop within 45 seconds shut off engine as the high pressure pump is capable of drawing fuel out of the fuel tank without the in tank pump running.
Fuel System Bleeding - Only Required if High Pressure Fuel System is Opened
- Open the hood.
- Ensure all fuel lines are connected. If fuel pump control module fuse was removed to relief fuel pressure, install fuse.
- Start the engine and apply 50-80% throttle for 1 minute.
- Release throttle and allow engine to idle.
- Turn the ignition OFF.
Bleeding air from the fuel system is only required if the high pressure fuel system has been opened.
Fuel bleed procedure needs to be followed to avoid damage to dampener assembly between engine and transmission.
Metallic rattle noise may be heard from dampener assembly between the engine and transmission while air is being purged from the fuel system. Do not let off of throttle if noise is heard.