F 350 4WD Super Duty V8-6.4L DSL Turbo (2008)
4. NOTE: Open the drain valve slowly to relieve the fuel system pressure. This may drain fuel from the system. Place the fuel in a suitable
container.
Once the fuel system pressure test is complete, open the drain valve on the special tool and relieve the fuel system pressure.
5. Install the Schrader valve cap.
