makes a filter unit that has the water
collector on the bottom and a small hand pump on the top of it so you can pull fuel into the filter. The stroke is about 3 inches. I have that on our second boat. That racor
has the inlet about level with the top of the tank. It's in a place where it can't be any lower or higher. Some times you can't get a choice.
Our first boat has a Y valve unit for switching between fuel tanks
and it also has a built in DC fuel pump
you can turn on manually. The unit is located under a hatch
in the galley
sole below the bottom of either tank. That pump can then bleed the system. It's most handy when you have more than one tank. You can still get an air lock but the self priming pump can handle it in every situation I've run across.