Fuel Tank Draining Procedure (Dual Tanks - Front)

Tools Required 

J 45004  Fuel Tank Siphon Hose. See Special Tools .

Fig 1: View Of Fuel Fill Hose
Courtesy of GENERAL MOTORS CORP.
1. Remove the fuel fill cap.
2. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
3. Loosen the fuel fill hose clamp at the front tank.
4. Remove the fuel fill hose from the front tank.
5. Insert the siphon hose from J 45004  into the fuel tank. See Special Tools .
6. Attach the siphon hose from J 45004  to the pump devise hose. See Special Tools .
7. Using a hand or air operated pump device, drain as much fuel from the tank as possible.