Patent ID: 8110114

Claim:
A method for maintaining an efficiently working fuel system through the use of a multiple filter controller, said method comprising: providing a first filter and a second filter; passing a fuel source through at least one of the first filter and the second filter, comprising providing a boost pump, wherein the boost pump pumps the fuel source through the first filter and the second filter; detecting when either of the first filter and the second filter are malfunctioning comprising detecting when the level of pressure generated by the malfunctioning filter has reached a predetermined level, wherein such detecting comprises providing a vacuum switch located downstream of the boost pump; redirecting the fuel source from the malfunctioning filter to the other of said filters when the predetermined level of pressure has been detected by the vacuum switch, wherein redirecting comprises: manipulating an inlet valve located upstream of the malfunctioning filter and of the other said filters such that the inlet valve stops the flow of the fluid to the malfunctioning filter and redirects the flow of the fluid to the other of said filters; and manipulating an outlet valve located downstream of the malfunctioning filter and of the other of said filters and upstream from the vacuum switch, and wherein manipulating the outlet valve prevents the fuel source from the malfunctioning filter from flowing downstream of the outlet valve and allows the fuel source from the other of said filters to flow downstream of the outlet valve; repairing or removing the malfunctioning filter from the fuel system while the fuel source is simultaneously flowing through the other of said filters; bleeding the multiple filter controller of excess air while repairing or removing the first filter, wherein bleeding comprises: providing a bleed valve positioned downstream from the vacuum switch; and utilizing the boost pump in conjunction with the bleed valve, wherein the boost pump is positioned upstream from the bleed valve and downstream from the outlet valve; and preventing the fuel source from backflowing into the boost pump, wherein preventing the fuel source from backflowing into the boost pump comprises providing a check valve in operable communication with the boost pump and located upstream from the vacuum switch.