Procedures

DRAINING FUEL TANK

WARNING: The fuel system may be under constant fuel pressure even with the engine off. This pressure must be released before servicing fuel tank.

Two different procedures may be used to drain fuel tank: through the fuel fill fitting on tank, or using a diagnostic scan tool.

The quickest draining procedure involves removing the rubber fuel fill hose from fuel tank fitting.

As an alternative procedure, the electric fuel pump may be activated allowing tank to be drained at fuel rail connection. Refer to appropriate scan tool for fuel pump activation procedures. Before disconnecting fuel line at fuel rail, release fuel pressure. Attach end of Fuel Pressure Test Adapter 6631 or 6539 at fuel rail disconnection (tool number 6631 is used on 5/16 fuel lines while tool number 6539 is used on 3/8 fuel lines). Position opposite end of this hose tool to an approved gasoline draining station. Activate fuel pump and drain tank until empty.

If electric fuel pump is not operating, fuel must be drained through fuel fill fitting at tank. Refer to following procedures.

1. Release fuel system pressure.

2. Raise vehicle.

3. If equipped, remove fuel tank skid plate.




4. Thoroughly clean area around fuel fill fitting (6) and rubber fuel fill hose (1) at side of fuel tank. After cleaning, loosen fuel fill hose clamp (2) at tank.

5. Before removing rubber hose (1) from fitting, note hose orientation while referring to index mark (3).




6. Disconnect rubber fuel fill hose at fuel tank fitting (2). Using an approved gas holding tank, drain fuel tank through this fitting.