Due to the fact that we seldom use the generator and to prevent the fuel from going bad, I designed this system. The fuel transfer system is simply an electric fuel pump that transfers fuel from the generator tank into the toy tank. It is designed to prevent overflow and accidental dumping of fuel onto the ground. This allows you to use the fuel in your toys or car that would otherwise be stuck in the generator tank. If you need to add fuel back into the generator tank, simply use the fuel pump from the toy tank.