What is Dual Fueling System? SN Engineering Dual Fueling is the concurrent combustion of two fuels. Dual Fuel solutions kit can be retrofitted on existing low and high-speed diesel engines to allow the usage of a mixture of Methane rich gas (most usually Natural gas) with Diesel as fuel. After mutation, the engine can resume operating with only Diesel also. However, a ‘Gas only’ function is not possible. During the Dual Fuel process, a reduced amount of diesel fuel functions as the ignition source for the air-gas mixture. The Methane rich gas mix substitutes a significant proportion of Diesel to deliver comparable heat energy during combustion in the cylinder. The emissions from such engines see an order of progress. In the current market requirements, this also means a significant price reduction.