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→Fuel System
Tanks should not have open cross-connections as this will reduce stability. As the boat heels, fluid will run to the lower side, adding weight. Consider a fuel-shut-off valve outside the engine room in case of fire.
[[File:FuelPolishingSystem.jpg|thumb|left|180px|Fuel polishing system for one or two engines with ganged valves. Booster pump flushes air from the system or transfers fuel from tank to tank. Oberdorfer or Walbro pump circulates fuel constantly to polish it. A day tank is not used. Filter details for second engine not shown. Detail of ganged filters not shown.– Adapted from Gulf Coast Filters (http://www.gulfcoastfilters.com/) & SeaSkills (http://www.seaskills.com/)]]
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].