How to Fix Leaking Printer Cartridges

Remove the cartridge from your printer and wipe both the housing and the cartridge with an alcohol-based wipe. Do not use a water-based solution for this as it may damage electrical components.
Clean the printer head where it touches the cartridge. Sometimes dust or debris at the connection point can cause leakage that is not due to a faulty cartridge.
Rub a white cloth or tissue over the cartridge until you have identified the leaking area. If it is only colored at the outlet, this means the cartridge is fine.
Inspect the cartridge once you have determined the location of the leak. You should see a crack or fault. If not, squeeze the cartridge until you can see the damaged area.
Wipe the cartridge once more after you have identified the location and cut a piece of tape large enough to cover the affected area.
Place the tape over the affected area and smooth as much as possible. You can then replace the cartridge in the machine and test to ensure the area is firmly protected against future leakage.