Device to supply an internal combustion engine with water coming from a tank of an exhaust system provided with exhaust gas after-treatment

A device (38) to supply an internal combustion engine (2) with water comprising one single tank (10) of an exhaust system (1) provided with exhaust gas after-treatment having an exhaust duct (3) and a first electromagnetic injector (13) designed to inject a water solution of urea under pressure into the exhaust duct (3);

• the tank (10) comprises a supplying device (16) to supply a water solution of urea provided with a first pumping device (11), which is drowned inside the tank (10) and draws from the tank (10) in to order to supply the water solution of urea under pressure to the first electromagnetic injector (13);
• the tank (10) is divided so as to have, on the inside, a first powder urea storage area (A) and a second water collecting area (B), and wherein the powder urea and the water are mixed in a third area (C) of the tank (10) so as to obtain a water solution of urea with a variable concentration, the device is characterized in that the device (38) comprises at least one second electromagnetic injector (40), which is designed to inject water into the internal combustion engine (2), and a second pumping device (39), which is drowned inside the tank (10) and draws from the second water collecting area (B) in order to supply water under pressure to said at least one second electromagnetic injector (40).