Our system is similar to MTs. There is a pair of saddle tanks on each side of the engine room. These gravity feed from their lowest points via manual valves to a 60 gallon day tank in the bilge between the engines. Both engines and the generator normally feed from this day tank and the fuel returns go to the day tank.
However each engine is capable of being fed directly from one of the two saddle tanks on its side of the boat and the fuel returns can be valved to return to a saddle tank. But we have never in 13 years of using the boat ever done anything but feed everything from the day tank and return everything to the day tank.
However each engine is capable of being fed directly from one of the two saddle tanks on its side of the boat and the fuel returns can be valved to return to a saddle tank. But we have never in 13 years of using the boat ever done anything but feed everything from the day tank and return everything to the day tank.