The tanks that pull from the top will usually have a screen or punched plate inside across the tank bottom.
The fuel draw is from above the plate which is hopefully seperateing the fuel from the gunk.
A drain valve (with plug to be more secure) is used below the screen to remove gunk as required.''
This is usually done on boats that do not have room for a proper sump.
Fine for inshore , less so for Blue Water boats.
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