mgreg

This topic may be old but I have some insight on this issue for anyone interested. I have been a huge fan of the Cupti for about a year. I have 4 or 5 devices but I always come back to the Cupti. I think it's a great all around device. Great flavor, superior coil life, durable (dropped it more than once) and so comfortable to hold and fire.
Imagine my disappointment when I recommended one to my son and it had this flooding spitting issue. I started him on a cheap vape pen and he was pumped to receive the Cupti after using mine for a few days. He has been cig free for 6 months now. All went well for a few puffs but as soon as he set it down for a few minutes it flooded big time. I gave him mine to use and messed with his FOREVER to no avail. I tried to return it but I was given all kinds of grief from the vendor who shall remain nameless. I ordered ANOTHER one from a different vendor in a different color. Surely I couldn't get two bad ones right? Wrong...
While I was waiting for the second one to come I did some in depth research and came across what others have mentioned. If you have an AIR leak anywhere in the system, you WILL have a juice leak. It's inevitable. If you don't have a vacuum the juice won't stay suspended in the tank. So let's find the air leak!
I took the chimney out, attached and inflated balloon to the drip tip and put it in water. Ever 15 seconds or so a bubble formed from the BOTTOM of the coil where the contact meets the bottom of the coil. I found that if I applied light pressure to the bottom of the coil with my finger while still in the water the bubbles stopped. So.... figuring I had nothing to lose I put it together and screwed it down HARD. Much harder than I would normally be comfortable with.
INSTANT PERFECTION! Subsequent refills I have just screwed it down normally. I haven't changed a coil yet so I don't know if I will have to screw a new coil in hard to seat it or not.
PART II
The new one arrived and of course had the same issue. No problem, I know what to do now! Wrong. It didn't work.
I gave this one to a friend who also has a Cupti. He loves to tinker with this stuff. He took a different approach. The first thing he did was swap chimney's with his working Cupti and my bad one. The new chimney leaked no matter where it was and his old one worked in either device. This limited the problem to the new chimney, not the whole device.
He then cleaned both chimneys and inspected then closely side by side to find the difference. What he found was that there is a groove about an 1/8" below the top gasket. On his (and mine) old unit there is an O ring. On the new one, just a groove, no ring. He pulled an O ring from one of his extra drip tips and placed it in this groove. Problem solved.
It's been about 3 weeks now and both of the new units are working perfectly. Not a single spit or gurgle.
So if you are reading this considering a Cupti, you are probably going to be scared to pull the trigger which is understandable but still a shame. If on the other hand  you already have one and it's spitting I hope one or both of these fixes work for you.
Hope this helps someone. As I said, once you get a Cupti firing properly it is a joy