Patent ID: 8241577

Claim:
A system for storing an additive and injecting it into the exhaust gases of an engine, comprising: two tanks for storing the additive and one pump for supplying the additive from these tanks in parallel to an injection line, these two tanks each being connected to the pump by a branch of the supply line, each of these branches being equipped with a non-return valve and these two valves being calibrated so that the non-return valve located in the branch coming from the first tank is normally open but closes when the first tank is empty, and so that the non-return valve located in the branch coming from the second tank is normally closed but opens when the non-return valve from the first tank is closed or when the branch coming from the first tank is blocked, wherein the two branches of the supply line open into a common section connecting them to the pump and being equipped with a heating device, and wherein a junction between the branches and the common section is made by a “T”-shaped connection located completely inside the second tank.