Fuel System Manual Control Valve (CNG): Service Precautions
WARNING:^ THE FUEL SYSTEM WILL REMAIN PRESSURIZED AFTER ENGINE SHUTDOWN. THIS PRESSURE MUST BE RELIEVED BEFORE SERVICING ANY PART OF THE FUEL SYSTEM, OR PERSONAL INJURY OR PROPERTY DAMAGE MAY RESULT.
^ EYE PROTECTION IS REQUIRED WHEN REMOVING OR INSTALLING FUEL SYSTEM COMPONENTS TO AVOID POSSIBLE INJURY.