Well, first do you sit it with the point down? Or is it up or on its side? Fountain pens don't have the blocking mech of modern pens. Gravity is what keeps the ink flowing in these treasures.
If you have the point down and it's still dry, then its probably that some excess ink in the nib has dried and is blocking the flow of the rest of the ink. A quick dab with a wet paper towel fixes that. Or if its very badly crusted then you may need to take the pen apart and rinse out the nib until the water runs clear. Sometimes a build up of old ink can cause that problem. Or if your pen is one of those with the internal tube (most I've seen are some type of rubber) that you re-fill with a little lever that is on the outside of the tube, then there could be an internal leak that is letting the ink seep into the body of the pen where it dries out, which can make it necessary to re-fill rather often as well as making repair an option if only to save on ink. :)
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If you have the point down and it's still dry, then its probably that some excess ink in the nib has dried and is blocking the flow of the rest of the ink. A quick dab with a wet paper towel fixes that. Or if its very badly crusted then you may need to take the pen apart and rinse out the nib until the water runs clear. Sometimes a build up of old ink can cause that problem. Or if your pen is one of those with the internal tube (most I've seen are some type of rubber) that you re-fill with a little lever that is on the outside of the tube, then there could be an internal leak that is letting the ink seep into the body of the pen where it dries out, which can make it necessary to re-fill rather often as well as making repair an option if only to save on ink. :)
Does that help?