It is not possible for the Federal Reserve to run out of money, they have the power given to them by the US Government to create and/or destroy as much money (USA dollar) as they want (all reserve banks work this way in all countries that have them). The only problem is when they create too much hyper inflation can occur, the solution to this is to tax people who have too much money and destroy it. Unfortunately the people who are currently in charge are not smart...