02e39f42_stem_Risks_of_Alternative_Fuel__Background
[Hazard --Event] Vehicle fire --from otherthanalternativefuel source [Consequences] A major vehicle fire is almostcertain to cause the CNG tanksto vent through the thermalprotection devices. This willcause a rapid release of naturalgas fuel and will make the firemuch more intense. Moreover,the natural gas supply maymake extinguishment of the fireinadvisable. [Knowledge] To date, no CNG vehicles areknow to have been involved in avehicle fire whose origin wasnot in the fuel system. However, vehicle fires do occurand experience with natural gasin stationary applicationsindicates that the presence of anatural gas supply canexacerbate fire damage. [Background] 
Fleet experience shows that many vehicle firesare of electrical origin. These fires theninvolve other vehicle components, such asplastic parts and eventually involve the vehiclefuel system.
Clean Air Program -- Assesment of the Safety, Health, Environmental and System Risks of Alternative Fuel
Background