The main components of the electronic control unit of CNG LPG ECU are alkanes, ethylene, ethane, propylene, propane and butane, of which methane accounts for the vast majority, and a small amount of ethane, propane and butane. In addition, there are generally hydrogen sulfide and carbon dioxide. , Nitrogen and water vapor and trace inert gases such as helium and argon.https://www.lnautogas.com/product/cng-lpg-ecu/