I have a black crown tank and recently its been leaking quite a bit from above the airflow ring.. I've tried replacing the orings once before.. Does anyone else have a suggestion? I actually loved the tank before the leaks and had just bought a pack of the nickel coils but now they are going unused sadly.,
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I know this was posted some time back, and I hope you found the problem to your leak, however I thought I would post my solution to this leaking problem to hopefully help others with the same issue. Uwell have a good reputation for build quality, so it's very unlikely that the O rings, or faulty coils are to blame for this problem.
I have two crowns, and both leaked until I came across the correct way to re-fill top filler tanks.
When top filling, follow these steps.
1. Close off AFC completely
2. Unscrew top
3. Fill, but don't overfill (as this won't allow you to "vacuum seal" your tank in the step below.)
4. Screw top back on
5. Turn tank upside down and allow juice to settle for a few seconds
6. Whilst upside down open up AFC fully (This creates the very important vacuum seal)
7. Turn tank right way up
8. Vape away with no leaks !
Avoid running the juice low as this makes the tank lose it's vacuum pressure seal. Always make sure there is enough juice covering the priming holes on the sides of the coil.
Since following these steps, I've not had any leaking issues whatsoever.
Hope this helps ;-)