How to Flush and Deep-Clean a Fountain Pen with a Bulb Syringe

A bulb syringe is one of the most useful tools in any pen enthusiast's kit. Here's how to use one to flush and deep-clean a fountain pen properly.

Why Use a Bulb Syringe?

A basic rinse under a tap or soak in water will clean most fountain pens adequately between ink changes. But when a pen has dried ink blocking the feed, stubborn pigment residue, or hasn't been cleaned in months, a bulb syringe gives you the pressure needed to flush the feed channels thoroughly, without disassembling the pen. For our general cleaning guide, see: How to Clean a Fountain Pen.

What You'll Need

A bulb syringe (also called an ear syringe or ink syringe)
Lukewarm water
A cup or small bowl
Paper towels or a lint-free cloth

A bulb syringe with a narrow nozzle tip works best, it needs to fit snugly into the section where the cartridge or converter sits. See our Fountain Pen Servicing Accessories guide for recommended tools.

Step 1: Remove the Cartridge, Converter, or Empty the Reservoir

Cartridge/converter pens: Remove the cartridge or converter entirely.
Piston fillers: Twist the piston down to expel as much ink as possible. See: How to Use a Piston Filler.
Vacuum fillers: Press the plunger down to empty the barrel. See: How to Use a Vacuum Filler Fountain Pen.

Set the barrel and cap aside, you'll only be working with the nib and section for most of this process.

Step 2: Fill the Bulb Syringe with Lukewarm Water

Squeeze the bulb, submerge the nozzle tip in lukewarm water, and release to draw water in. Avoid hot water, it can damage resin and rubber components.

Step 3: Attach the Syringe to the Section

Press the nozzle of the bulb syringe firmly into the back of the section (the opening where the cartridge or converter normally sits). You want a reasonably snug fit so water is forced through the feed rather than leaking around the seal.

Step 4: Flush Water Through the Feed

Gently squeeze the bulb to push water through the feed and out through the nib. You'll see ink-coloured water emerge from the nib tines, this is the old ink being flushed out.

Squeeze in short, controlled bursts rather than one hard push. Excessive pressure can stress the feed or nib on some pens.

Step 5: Repeat Until the Water Runs Clear

Refill the syringe and repeat the flush. Continue until the water coming out of the nib is completely clear. Depending on how long the pen has been sitting or how saturated the feed is, this may take 5-10 flushes.

Step 6: Flush from the Nib End (Optional, for Stubborn Blockages)

If water isn't flowing freely through the feed, try reversing the direction: hold the nib under a gentle stream of lukewarm water from a tap, or use the syringe to push water in from the nib end back through the feed. This can dislodge dried ink that has settled deep in the feed channels. If the pen still won't flow after this, see: How to Re-Ink a Dried-Out Pen.

Step 7: Final Soak (If Needed)

For a heavily soiled pen, follow the flush with a 30-minute soak of the nib and section in lukewarm water. This softens any remaining residue before a final flush.

Step 8: Dry and Reassemble

Shake out excess water gently, then leave the nib and section to air-dry on a paper towel for at least an hour. Once dry, reassemble and re-ink as normal.

Tips

Use distilled water if your tap water is very hard, mineral deposits can build up in the feed over time.
Don't force it. If the syringe won't seal against the section, wrap the nozzle tip in a small piece of silicone tape to improve the fit.
Piston and vacuum fillers can often be flushed by drawing up and expelling water repeatedly using their own mechanism, the syringe is most useful for cartridge/converter pens where you can't do this.
Keep a syringe in your pen kit. It's inexpensive, reusable, and makes cleaning significantly faster. See our full accessories guide: Fountain Pen Servicing Accessories: A Guide.