Fuel Tank Draining

WARNING: Safety Goggles and Fuel Warning

Disconnect the battery negative cable. Battery Negative Cable Disconnection and Connection .
CAUTION: The fuel tank is fitted with a fuel tank filler valve. This filler valve is located on the end of the fuel tank filler hose at the entrance of the fuel tank. To prevent damaging to the fuel tank filler valve during fuel tank draining, a flexible but inherently stable suction hose with a diameter of no more than 10 mm (0.4 in) must be used.

NOTE: The fuel tank must be drained with a suitable, commercially-available fuel removal unit and suction hose - follow safety regulations and national legislation. In the presence of fuel vapors or escaping fuel - observe safety regulations and national legislation. Store drained fuel in a suitable, sealable container.
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle
Fuel Tank Filler Pipe Ground Bolt (2)» Remove

Fig 1: Fuel Tank Filler Pipe Ground Bolt
Courtesy of GENERAL MOTORS COMPANY
Fuel Tank Filler Hose Clamp (3)» Loosen

Fig 2: Fuel Tank Filler Hose Clamp
Courtesy of GENERAL MOTORS COMPANY
Fuel Tank Filler Hose (2) @ Fuel Tank» Disconnect
Fuel Tank Filler Vent Pipe (1) @ Fuel Tank Vent Pipe» Disconnect - Plastic Collar Quick Connect Fitting Service
Insert the suction hose into fuel tank filler pipe inlet at the fuel tank.
Attach a suitable suction hose to the hose used with the hand or air operated pump device.
Using a hand or air operated pump drain as much fuel from the tank as possible.