Here's some reading material that should answer any and all questions you have regarding cartotanks.I have 2 IBTanked carto tanks. A standard and an XL. I can't get either one of them to keep primed. It works good for a few draws and then a very nasty dry hit. Still trying to figure it all out and get it running right. Do you need to adjust the volts differently than you do for a bottom feeding tank?
http://www.e-cigarette-forum.com/fo...ethod-carto-filling-k-upside-down-condom.html
http://www.e-cigarette-forum.com/fo...-5-baditudes-cartomizer-tank-setup-guide.html
http://www.e-cigarette-forum.com/forum/blogs/baditude/4830-8-cartotank-help-noob.html
http://www.e-cigarette-forum.com/fo...95-2-vendor-list-pre-punched-cartomizers.html