Abstract: An automated system for fuel polishing stored fuel in multiple storage tanks by circulating fuel in two or more distinct fluid paths, wherein the system comprises automatically actuating two or more two-way valves when changing fluid paths. In preferred embodiments the system does not comprise a system controller that activates an automated three-way valve.

Abstract: An automated system for fuel polishing stored fuel in multiple storage tanks, and methods for making and using such systems, such methods including the use of an apparatus comprising a pump having a flow velocity sufficient to suspend settled impurities in a fuel storage tank, at least a first and second fuel storage tank each having an inlet and an outlet; said at least one filter; a fluid pathway connecting said pump, said fuel storage tanks, and at least one filter; a first three-way valve positioned at a junction between the inlet of at least said first and second fuel storage tanks; a second three-way valve positioned at a junction between the outlet of at least said first and second fuel storage tanks; and a system controller component operably connected to said first and second three-way valve to automatically control the position of each valve without manual intervention.