Pick up tubes are usually close to the tank bottom, but there is almost always a slight dead space.
When I fitted out my tanks, I installed pickup tubes about 1 cm off the bottom, as well as and outlet off the lowest corner of the tank which goes to the sight glass and drain. I can also divert this to feed the engine.
Having a sight glass feed from the lowest point will allow you to see the smallest trace of water when you check your fuel level.
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