Sea Foam can be used as a fuel "stabilizer" but if I am not mistaken, the Sea Foam must be added "before" the gas becomes old - so, if your gas is already old, simply adding Sea Foam to it likely will not help it. The way it's designed, you add it along with the fuel, when you first pump it into the storage container, and it can help stabilize the fuel for 1-2 years.
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Sea foam can help treat old gas by stabilizing it and breaking down harmful deposits that may have formed over time. The chemicals in Sea foam can restore volatility to the fuel, making it easier to burn and improving engine performance. It is a popular choice for cleaning out fuel systems and revitalizing engines that have been sitting dormant for a while.