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A polishing system for two tanks and one engine is shown. It is designed to polish fuel with or without the engine running. When running, the filters can be bypassed if they clog and you need to hot-swop them. If the engine fuel pump fails, the polishing pump serves as a backup to keep the engine going. The vacuum gauge after the filters monitors their condition. A new set of filters will show about 3-inches of mercury. An engine will begin to starve around 10 inches as the filters become restricted [36].<ref>Fuel Filters, Tony Athens, http://boatdiesel.com/Articles/</ref>