So I am currently in the final stages of a complete rebuild and (twin)carbs are being reconnected and I have all fuel, reserve and return connected.
However the 4th (vertical) output of the fuel tank goes to a "relief valve" then to a (fuel?) filter or some sort of filter (Mounted right under the front of the seat opening of the hull). Through my research I found that from 95 to 96 there was an omission of a hose connection on the duct at the very rear of the inside of the hull.

From all the diagrams I've seen this hose coming out of said (fuel?) filter should go to this duct.

So my question is having a 96 model where do I connect this hose?

and more out of curiosity than anything why does the (I'm going to call) "breather" from the fuel tank go to a valve then a large filter of some sort just to be fed out to a "breather"?

Any help is much appreciated. Thanks in advance.