Fuel Tank Design 101

[Locke N Load]

I will add my two cents based on the other responses as well.

There are two situations where you will most likely be adding fuel; on the water or on a trailer. If you are in the water the stern is going to be the lowest point and likely the same on a trailer, but not as extreme. This is where the pickups and fuel line to the motor should be with the fuel fill and vent at the bow end of the tank. The fuel tank will be able to be filled to its maximum amount this way and while under way the most of the fuel will be able to be used in case of a running out of fuel situation. At least this is what makes sense in my mind.