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[UPDATED] Pilot custom 823 vacuum filler burping ink and broken blind cap :(


BambinoFortunato
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I’ve read that large capacity vacuum filler fountain pens can burp ink when the ink level gets close to empty because there’s more air in the pen for your hand to warm up and expand. Most of the descriptions of this I’ve found mention cheaper vacuum fillers like PenBBS or TWSBI and note that higher end ones shouldn’t have this issue. However, my broad nibbed Pilot Custom 823 tends to do this when the ink level gets very low. Should this not be the case? It’s not a huge deal as I can refill before it gets quite that low anyhow, but I’m curious as to whether there’s something defective about it. (Currently using Pilot Iroshizuku Yama-Guri, and Sailor Shikiori before that.) The burping usually comes in the form of ink blots collecting on top of the nib and in the cap as well as pooling along the bottom ridge of the section facing the nib. 

 

I’ve been told the 823 should be far and away my best writer. I do love it a lot but is a little finicky. It can run drier or wetter at times and there’s the above burping when nearly empty. Actually, it’s my Pelikan m200 at half the price of the 823 which is my most low-maintenance and most consistent writer in terms of flow, performance, etc. 

...

UPDATE: Now it turns out that even when the blind cap is unscrewed, the piston rod still pushes all the way down, sealing the ink reservoir and the blind cap no longer pulls away from the barrel as it unscrews. I tried to screw the blind cap back down and it just keeps spinning. So, it won't fill unless you push the plunger down, then pull it out a little bit. It used to be that unscrewing the blind cap naturally pulled the piston back slightly, unsealing the reservoir and there would be a gap between the blind cap and the barrel. Something really wrong here. I'm going to exchange the pen. I think that the screw threads in the blind cap must be broken, allowing the rod to descend all the way even when unscrewed. I wonder how this happened. I hope I don't have the same problem after I exchange it.

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I have several Custom 823s and I use them as my daily writers. I fill them with Pilot Blue Black ink or Pilot Black ink. I have never had any of them burp—I have burped when using them, but I believe that is coincidental. I usually carry two or three with me to work. I write with them until they run dry. 

 

Burping—for pens—is just the result of physics; the heat of your hand causes the air in the ink chamber to expand. 

 

My pens are also very consistent writers. I have no problems with wetter or drier flow. I only have Fine or Medium nibs, though. I have never tried the Broad nib pens. 

 

It looks like you live in Washington DC. You might consider contacting Pilot Pens USA or taking a trip to see the Pen Doctor at Fahrney's. 

"One can not waste time worrying about small minds . . . If we were normal, we'd still be using free ball point pens." —Bo Bo Olson "I already own more ink than a rational person can use in a lifetime." —Waski_the_Squirrel

I'm still trying to figure out how to list all my pens down here.

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4 hours ago, BambinoFortunato said:

Most of the descriptions of this I’ve found mention cheaper vacuum fillers like PenBBS or TWSBI and note that higher end ones shouldn’t have this issue.

 

“High-end” vacuum-filled and eyedropper-filled pen models “shouldn't have this issue” if you screw their blind caps down; the plug inside the barrel will stop the flow of both ink and (expanding) air into the feed, which prevents the pen from burping while writing with it, should the differential in air pressure inside and outside the ink reservoir change significantly.

I endeavour to be frank and truthful in what I write, show or otherwise present, when I relate my first-hand experiences that are not independently verifiable; and link to third-party content where I can, when I make a claim or refute a statement of fact in a thread. If there is something you can verify for yourself, I entreat you to do so, and judge for yourself what is right, correct for valid. I may be wrong, and my position or say-so is no more authoritative and carries no more weight than anyone else's here.

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I keep my blind caps open all the time, except when flying. I've never had any trouble with (the pens) burping. 

"One can not waste time worrying about small minds . . . If we were normal, we'd still be using free ball point pens." —Bo Bo Olson "I already own more ink than a rational person can use in a lifetime." —Waski_the_Squirrel

I'm still trying to figure out how to list all my pens down here.

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If the air in the chamber is cool enough and your hand is warm enough, the pen is going to burp. The ink has to go somewhere. I suspect that the reason higher end pens are less likely to burp is because the barrel material is thicker causing the air in the chamber to warm more slowly and release the pressure as you write. 

 

The blind cap shouldn’t spin though

To hold a pen is to be at war. - Voltaire
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