FUEL SUPPLY SYSTEM FOR FOUR-STROKE ENGINES

The inventive system consists in providing a main pipe in which the air arrives from the filter (FA), the flow rate of the air being controlled by a main (1) or gas butterfly valve. the main pipe also comprises a secondary butterfly valve (2) which, in all operational modes (steady state and unsteady state), maintains the opening necessary to produce the pressure drop which, together with the Venturi effect generated in the section of the pipe downstream of the secondary butterfly valve and the pressure drop in the air filter (FA), creates the appropriate suction at the outlet (3) for the emulsified fuel which mixes with the air current. The fuel comes from a constant-level tank (4) which communicates with the atmosphere such that the suction at the outlet produces an inflow which is controlled by the main jet (5) and which, emulsified with air from the tube (9) having transverse holes, discharges into the central pipe of the system (11) by means of the outlet.