Remove the fuel tank cap and properly relieve the fuel system pressure before performing any work on the fuel system or fuel system related components. After the pressure has been released a small amount of fuel may be released when servicing a component. In order to reduce the risk of injury cover the component with a shop towel before disconnection. This will catch any fuel that may leak out. Properly dispose of the shop towel.
Before servicing the vehicle, refer to the Precautions Section.
Disconnecting the negative battery cable on some vehicles may interfere with the functions of the on-board computer systems and may require the computer to undergo a relearning process, once the negative battery cable is reconnected.
If working near and/or around the SRS system and components, be sure to properly disable the SRS system. See disarming/arming the SRS system.
For vehicles equipped with OnStar (RPO UE1), with battery backup, the backup battery is a redundant power supply to allow limited ONStar functionality in the event of a main battery power disruption to the OnStar module (VCIM). Do not disconnect the main vehicle battery or remove the OnStar fuse with the ignition key in any position other than OFF. Retained accessory power should be allowed to time out or be disabled by opening the driver-s side door before disconnecting power. Disconnecting power to the module in any way while the ignition is ON or with the retained accessory power activated may cause activation of the OnStar backup battery system and will discharge and permanently damage the backup battery. Once the backup battery is activated it will stay on until it has completely discharged. The backup battery is not rechargeable and once it is activated, it must be replaced.
Disconnect the negative battery cable.
Remove the fuel filler cap.
Use a hand operated pump device to drain the fuel from the fuel tank.
Be sure to properly dispose of drained fuel.
Install the filler cap.