Cartomizers leaking are normally due to 2 issues. Flooding, and clogged.
To fix a flooding issue:
- Remove from battery.
- Place the threaded end in a paper towel.
- Blow through the mouth end of the cartomizer. This will remove the excess eliquid.
- Wipe the threaded connection clean and dry.
- Make sure to clean the battery connection as well.
Leaking from being clogged:
- Clogged cartomizer, there is nothing you can do but to replace it.