F 150 4WD Pickup V8-5.4L CNG VIN M (2001)
20. Turn in the manual lockdown valve jackscrew on the fuel tank solenoid valve.
21. Repeat the procedure until all affected tanks are vented.
20. Turn in the manual lockdown valve jackscrew on the fuel tank solenoid valve.
21. Repeat the procedure until all affected tanks are vented.