Loading a fountain pen depends on which filling system your pen uses. Most fountain pens fall into one of a few categories: cartridge, converter, piston filler, vacuum filler, or eyedropper. Each works differently, but the core idea is always the same: get ink from a source into the pen’s reservoir and through the feed to the nib.
Before You Load: Flush a New Pen
New fountain pens often arrive with residual oils, dust, or manufacturing grease on the feed and nib. Some brands even dip-test their pens with ink at the factory, leaving dried traces behind. These residues can cause inconsistent ink flow or skipping right out of the box.
A quick rinse solves this. Run lukewarm water through the nib and feed until it comes out clear. If your pen came with a converter, attach it and draw clean water through the nib several times, then expel it. For stubborn grease (common on budget pens like Jinhaos), add a tiny drop of dish soap to a bowl of lukewarm water and soak the grip section for a few minutes before rinsing. Let everything air dry before loading ink.
Loading an Ink Cartridge
Cartridges are the simplest way to fill a fountain pen. They’re pre-sealed plastic tubes of ink that snap directly into the pen’s grip section.
Unscrew the barrel from the grip section to expose the back end where the cartridge seats. Take a fresh cartridge and orient the narrow, sealed end toward the pen. Line it up with the opening in the grip section and push gently until you hear or feel a click. That click means the pen’s internal post has pierced the cartridge seal, and ink can now flow into the feed.
Ink won’t reach the nib instantly. You can wait a minute or two for capillary action to pull ink through the feed, or speed things up by gently squeezing the cartridge body. This forces a small amount of ink forward and primes the feed so you can start writing immediately.
One important detail: not all cartridges are interchangeable. Many pens use the international standard cartridge size, but brands like Pilot, Platinum, and Lamy use proprietary cartridges that only fit their own pens. Check compatibility before buying.
Using a Converter With Bottled Ink
A converter replaces a cartridge and lets you fill from bottled ink instead. It plugs into the same opening on the grip section. Converters come in two main styles: piston and squeeze.
For a piston converter, start by twisting or pushing the piston all the way toward the nib end (this expels air). Submerge the nib and most of the grip section into your ink bottle. Then draw the piston back, away from the nib, by twisting clockwise or pulling it out depending on the model. This creates suction that pulls ink up through the nib and feed into the converter. Pull the pen out of the ink, and you’re loaded.
Squeeze converters work even more simply. Compress the rubber bladder inside the converter and hold it while you dip the nib into ink. Release the bladder, and the vacuum draws ink in through the nib.
With either type, you’ll usually get a partial fill on the first draw. You can repeat the process (expel and redraw) two or three times to maximize capacity. After filling, wipe the nib and grip section with a lint-free cloth before reassembling the pen.
Filling a Piston Filler Pen
Piston filler pens have a built-in filling mechanism rather than a removable converter. The entire barrel serves as the ink reservoir, which means they hold significantly more ink than cartridge or converter pens.
At the end of the barrel, you’ll find a knob (sometimes called a blind cap). Turn this knob counterclockwise to advance the internal piston toward the nib, pushing air out. Submerge the nib fully in your ink bottle. Then turn the knob clockwise to retract the piston back toward the end of the pen. This draws ink up through the nib and feed and into the barrel. The piston rides on a threaded rod inside the barrel, working like a spindle screw, so the motion should feel smooth and mechanical.
As with converters, you can cycle the piston down and back up a second time to get a fuller load. Wipe the nib clean before capping.
Filling a Vacuum Filler Pen
Vacuum fillers use a plunger rod that creates a sudden rush of suction to fill the barrel in one stroke. The process feels different from a piston filler.
Start by pulling the filler knob (at the end of the barrel) all the way up until it stops. This draws air into the chamber and primes it for filling. Next, submerge the nib and grip section into your ink bottle. Make sure the filler hole near the nib is fully covered by ink. Then press the filler knob straight down in one smooth, controlled motion. As the rod reaches the bottom, the vacuum it creates pulls ink rapidly into the barrel. Vacuum fillers tend to fill to near capacity in a single stroke, which is one of their advantages.
Eyedropper Filling
Some simple fountain pens, particularly demonstrators and certain budget models, can be converted to eyedropper fillers. Instead of any mechanical system, you pour ink directly into the hollow barrel using a pipette or syringe. The entire barrel becomes the reservoir, giving you maximum ink capacity.
The tradeoff is leak risk. To prevent ink from seeping out at the threads where the barrel meets the grip section, you need to create a reliable seal. Stretch a small silicone O-ring over the threads of the grip section and roll it all the way down to the base. Then apply a thin coat of 100% silicone grease over the threads with a toothpick. The O-ring provides a physical barrier and the grease fills any remaining gaps.
Once sealed, unscrew the barrel, use an eyedropper or blunt syringe to fill it about 80% with ink (leaving some air helps regulate pressure), and screw the barrel back onto the grip section. Reapply silicone grease every few fills to maintain the seal.
Refilling Empty Cartridges With a Syringe
If your pen only accepts proprietary cartridges and doesn’t have a converter option, you can still use bottled ink by refilling spent cartridges with a blunt-tipped syringe. This is also a good way to save money on cartridges over time.
Use a blunt dispensing syringe, not a sharp hypodermic needle. A gauge between 16 and 20 fits most cartridge openings well. Narrower gauges can clog, and wider ones may not fit. Draw ink from the bottle into the syringe, insert the needle into the open end of an empty cartridge, and fill it. Save your used cartridges for this purpose, and make sure the cartridge matches your pen’s proprietary size.
Choosing the Right Ink
Only use ink specifically labeled for fountain pens. Calligraphy ink, India ink, and drawing inks are thicker, pigment-based formulas designed for dip pens. They contain binders like shellac or gum arabic that harden when dry. These will clog your pen’s feed and can permanently damage it. Inkjet printer ink is also off-limits for the same reason.
Fountain pen ink is dye-based and formulated to flow through the narrow capillary channels in a pen’s feed without drying out or leaving deposits. Stick with reputable fountain pen ink brands and you won’t have issues.
Priming and Wiping After Filling
After filling by any method, ink sometimes takes a moment to travel through the feed to the nib. If your pen doesn’t write immediately, there are a few ways to prime it. The simplest is to dip just the nib and feed into your ink bottle briefly. This saturates the feed and kickstarts capillary action so ink begins flowing from the reservoir. With a cartridge, you can give the cartridge body a gentle squeeze to push ink forward.
Before you cap the pen and start writing, wipe excess ink off the nib and grip section. Paper towels work but can leave lint between the nib tines. A lint-free cloth like a microfiber towel, cotton handkerchief, or even a clean cloth diaper does a better job. A quick wipe keeps your fingers clean and prevents ink from drying on the outside of the nib.