My 2320 has a fuel gauge right on the dash , it might be something new since you had your 2320. But I did look it up in my new technical manual and yes the 2320 does have self priming fuel system. again, this may be something new since you had yours.
2320 has geared final axle also, just not offset like the 2520. The dealer is the one that brought that to my attention. Like he was telling me to quit second guessing the engineers that design these tractors. No matter which one I buy they are all top notch. I really liked the 2305, but sold out of new.
I was approved for a 3320 but my neighbor told me to stay away from the electronic transmission hydro and get a 4105 like he has. but the 4105 is too big for what i need . Even the 3320 is too big in physical size for where I will be using (does me no good if I can't use it)
I may be a first time tractor buyer but as I was sitting on the 4105 and the 3320 the wife reminded me neither one of those would be able to get in the back of the house (we have rock bluffs right up next to the house) so it would be useless to buy something so big that we could not use it for what we were buying it for!!! Money or cost was not the factor in purchasing, it was function for what "I" needed. So I either move the house, move the rock bluffs, or buy a tractor that I can actually use!
And no I did not buy the 2320 because the wife thought it was cute, I bought it because of she liked the cup holder.