With little use, the ink may have dried up in the ink channels. As a result, there is no ink supply or the pen actually starts to leak. A fountain pen needs maintenance, it is easily remedied with the instruction below;
Rinse the front part with cold water, starting at the filling connection. Rinse until clear water comes out. Then soak overnight in a glass of cold water.
Rinse well with cold water and blow through to prevent scale from forming.
Allow to dry* then insert a refill and start writing.
If necessary, repeat the instructions. Then the problem should be solved. Recommended once every 3 months. A clean pen writes best.
Should you not use the fountain pen daily, store it in a vertical position with the tip facing up. This will prevent ink from drying into the channels.
*Tip: It is best to let it dry in a glass with a tissue or kitchen roll at the bottom.