Patent ID: 8424724

Claim:
A system for storing an additive solution and injecting it into the exhaust gases of an engine, said system comprising: two tanks that store the solution, the two tanks including a first tank and a second tank; and a pump that supplies the solution from the two tanks to an injection line, wherein the two tanks are in parallel and each of the two tanks is connected to the pump by a branch of a supply line, wherein a first branch coming from the first tank gives rise to lower pressure drops than a second branch coming from the second tank so that the solution is normally withdrawn mainly from first tank and is withdrawn from second tank, and is only withdrawn from the second tank when the first tank is non-operational, wherein the first branch and the second branch are made up of sections of substantially cylindrical lines of different diameters, wherein both the first branch and the second branch are connected to the pump by a common section, and wherein the system comprises at least one non-return device in the first branch.