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Module 4: NGV Safety Practices and Procedures


                Module 4: Knowledge Check

            NGV industry best practice recommends inspection of the entire CNG fuel system:
                □  Every 3 years or 36,000 miles (light-duty vehicles)
                □  After any fire or accident
                □  At least every 12 months (medium- and heavy-duty vehicles)
                □  All of the above

            It is unsafe to bring a known leaking vehicle inside a maintenance facility; leaking vehicles should remain outdoors.
                 □  True
                □  False

            Signs of a leak on a CNG vehicle include:
                 □  Hearing a hissing sound
                □  Smelling the “rotten egg” odor
                □  Formation of ice around a fitting
                □  All of the above

            The first step when servicing the CNG fuel system on a natural gas vehicle is to:
                □  Defuel the vehicle
                □  Identify the component and determine whether it is a high- or low-pressure component
                □  Turn off the gas supply
                □  Check the methane detection system

            The most common safety practice when welding on or in close proximity to natural gas vehicles is to:
                 □  Conduct welding outdoors
                □  Check the methane detection system
                □  Protect the CNG fuel system components with a welding blanket
                □  None of the above





























                                           NGV Essentials and Safety Practices (CNG & LNG)                            © 2024 AFVi All Rights Reserved    Page 4-4
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