Fuel Manifolds

There's another Thread concerning a Post(pun intended) who is having trouble figuring out the Fuel Manifold. Many years ago, I was aboard ... I want to say it was a Crescent yacht, somewhere in the 100 foot range. On the forward wall of the Engine Room were sight tubes, one for each tank, along with all of the Manifolds labeled so clearly, that a drunk Chimp could figure out what needed to be done. You could choose any tank sending the fuel to be polished and return to the same tank, so on and so forth. I was the most incredible system I'd ever seen, or have seen since. Some body did their homework.(for a change)