Need some more help with vacumatic filling instructions. I know that I am supposed to hold the button down when I pull the pen out of the ink. This is supposed to suck some ink out of the section. However, after filling the pen it leaks into the cap for a couple days then it is fine. How do I avoid this mess and hassle after filling the pen?

The simplest think I can suggest is draining a little ink into a paper towel while wiping the hood.

Let the plunger up slowly -- if you just take your finger off, it will likely pull air up the air return slit, leaving the collector full of ink. If you let it rise more slowly, you won't break the surface tension of the ink, and you will pull more ink out of the collector.

Aerometrics require that you drip a few drops of ink back into the bottle, too, when filling, or you get the same problem.

If letting the plunger rise slowly out of the ink doesn't help, expel a drop or two of ink back into the bottle and then wipe and see if that fixes the problem.

If you get flooding at any other time when writing other than the first few lines after filling, you have a leaking diaphram.

Peter

Really?
I have never heard that about the Aeros nor the "slowly rising plunger" issue with Vacs.

From Richard Binder's site
Vacumatic
"To fill: Remove blind cap. Immerse nib and part of section into ink. If the pen has a Lockdown filler, the spring-loaded plunger is latched in the depressed position; in this case, press on the end of the plunger, twisting the plunger very slightly counterclockwise, and release. The plunger should extend. Press quickly and release. Parker instructions said to press and release the plunger 10 times, waiting one second at the top of each stroke; but I find that some Vacs require more strokes, and a one-second wait is not always long enough to allow the pen to draw as much ink as it will. Continue pressing and releasing until no more bubbles appear on the downstroke, pausing two or three seconds at the top of each stroke. If the pen has a Lockdown filler, press one final time and twist the plunger slightly clockwise to latch it. Remove pen from ink and clean. Replace blind cap. (For a Vacumatic-filling “51”, remove the pen from the ink before releasing the plunger on the final stroke in order to suck excess ink from the nib area into the collector.)"

Aerometric
"To fill: Remove barrel. Immerse nib and part of shell into ink. Press and release pressure bar several times until no more bubbles appear, waiting three seconds after each squeeze. Some pens have instructions imprinted on the sac guard to indicate the number of squeezes required, but looking for bubbles is a more positive indication. Remove pen from ink. Squeeze three or four drops back into the bottle and release the pressure bar in order to suck excess ink from the nib area into the collector. Clean. Replace barrel."

Thanks for the info.
Does laying the pen horizontal overnight also cause this?
Should they be stored nib up in a stand?

My 51s lay horizontally all the time on my desk... sometimes for days on end without any problems.... so I doubt that is your problem