I believe the newer ones did, not sure of the change date. The only time you will have a problem is going up a steap hill with low fuel in the tank
I have a early series and it has a fuel pump. Rebuild kits are available.
A lot of twenty twos had the pump bypassed by the owner/operator when they failed, so you see a lot of them set up that way.
I have to go uphill in some areas when I disc the weeds down so gravity feed didn't work for me. I installed a small electric pump and battery and that has worked out well. The battery will last about 5 hours before needing a charge and that is plenty for the small area that I do.