1. Not sure where the outlet is!

I cant see a valve so I am sure there must be some need for this. I was assuming one of the two outlets at the back of the tank were something like this. Might try turning the tank around a few angles to see it owt leeks and then figure if it leeks it needs something.
Cheers
Mark

From memory its out the back of the tank at the bottom near the fuel filter, one long pipe which goes down thru the frame towards the bellypan

Mark I thought I would put my answer to your PM here as others may want to comment or take note

"Yes the Breather comes through from the underside of the tank, the other is the drain to stop rain water building up and then getting into your fuel every time you open the cap

On the underside of the tank on my 750 Monster they are marked Bleed and Drainage respectively
These can block up and I have had to use welding wire to clean them out before
The Drain is outside of the fuel cap seal so under normal circumstances shouldn't see petrol other than when over filling or being a bit sloppy when filling . The bleed should come up to a small rubber grommet like thingy that lines up with the breather in the standard filler cap which should contain a one way valve so no catch bottle needed

Most cheap Aftermarket filler caps fitted to Ducatis are actually Yamaha ones and the breather is in the wrong place to align with the bleed on the Ducati tank.

New fuel cap on. Countersunk bolts on order. The new cap mechanism needs countersunk, where as the old one did not. Try getting bolts on a Saturday!

All on and good flow with a new fuel filter added as I cut the last one open to have a look see.

Have revelaed most of the frame number, enough to see it hsa not been tampered with. Hope thats sufficient. I am afraid to rub much more it looks like it could be rubbed away.

Many Thanks folks

:)