Maybe by saying open tank they mean a tank that has a flat portion on the tank of the sending unit to drill and have the fitting seal.
My beef with the fuelab is their draw straw for these diesel install kits is only 1/2" yet all their other pumps require -10 or 5/8 supply to the pumps. If they're recommending 1/2, just use the factory supply lines. Not like that solves your problems, but like you said its really not that hard, and they should have done this from the get go. Seems they made these pumps so they can be swapped out when a fass or air dog fails and just use the pre existing install kit.
My beef with the fuelab is their draw straw for these diesel install kits is only 1/2" yet all their other pumps require -10 or 5/8 supply to the pumps. If they're recommending 1/2, just use the factory supply lines. Not like that solves your problems, but like you said its really not that hard, and they should have done this from the get go. Seems they made these pumps so they can be swapped out when a fass or air dog fails and just use the pre existing install kit.