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The main task of the fuel supply internal combustion engines is to fill the cylinder with fuel and air in a way that ensures the correct course of combustion and, in an amount corresponding to the instantaneous engine load, i.e. in a quantity to develop heat. Until recently, it was used two basic ways to power engines: carburettor and injection molding. Carburetors due to numerous shortcomings and imperfections are less frequently used. In the injection system, the fuel is injected by the injection pump during the compression stroke, shortly before the piston reaches its uppermost position.
