Refueling and rearming station

[Ajamu]

So I got into tanks and I decided I would make a garage where I would park them and have them be refueled and rearmed with requester chests and fast inserters. It worked great at first glance, but later I checked and found that these arms had completely filled the tanks storage with fuel. TLDR; Is there a way to make it so tanks will only be fueled as far at the fuel slot, same with shells and magazines?

[DaveMcW]

Upgrade to 0.12, then middle-button-click each tank slot and assign it to something other than fuel/ammo.