Combustion system and method of using fuel composition as fuel for remolded diesel engine

A method of using a fuel composition as a fuel for a remolded diesel engine, comprising applying the fuel composition to the remolded diesel engine, wherein:

• the fuel composition is composed of water, a fuel oil and an emulsifying agent, the amount of water ranging from 10 wt % to 90 wt % based on 100 wt % of the combination of the water and the fuel oil and the amount of the emulsifying agent ranging from 0.5 wt % to 10 wt % relative to 100 wt % of the combination of the water and the fuel oil,
• the remolded diesel engine comprises a cylinder unit and a combustion chamber defined by the cylinder unit, the cylinder unit having an inner surface facing the combustion chamber, a catalyst being coated on the inner surface and being selected from the group consisting of a metal, an alloy of the metal, a composite containing oxides of the metal, a salt of the metal and combinations thereof, the metal being selected from the group consisting of platinum, nickel, cobalt, copper, molybdenum, titanium and combinations thereof.