VEHICLE SYSTEM AND METHOD FOR INJECTING AN AQUEOUS SOLUTION IN THE COMBUSTION CHAMBER OF THE INTERNAL COMBUSTION ENGINE

The present invention relates to a vehicle system () configured for injecting an aqueous solution in an air intake line () upstream of a combustion chamber () of an internal combustion engine, or in the combustion chamber () of the internal combustion engine, said vehicle system () comprising the following constituents: ⋅a tank () to store an aqueous solution; ⋅a pump (); ⋅an air intake line () upstream of a combustion chamber () of an internal combustion engine; ⋅one or more injectors () configured for injecting aqueous solution in the air intake line (), in the combustion chamber () or both; ⋅a feed line () configured in for feeding said injector () with aqueous solution pumped by the pump (). In the vehicle system, at least a portion of at least one of the vehicle system constituents () or of a tank () component () is made of a polymer material. The polymer material—comprises an effective amount of at least one antimicrobial agent, or—has on its surface a surface coating containing at least one antimicrobial agent, the surface coating comprising between 0.001% by weight and 0.25% by weight of the at least one antimicrobial agent.