Ah, I just saw your latest diagram. I would definitely use gravity feed between day tank and engine
, so a connection low on the side of the day tank instead of a pick-up tube. That is about the best feature of a day tank if it's located high enough. Some even remove the engine
pump, replacing it with a cover. I am not sure if they always remove the engine mounted fuel filter
in that case. I would. With my system without day tank, I don't change the engine mounted fuel
filters anymore. Only when they start rusting. When I took off the genset filter after 2,000 hours it was as clean as new inside.