MS, the problem is that Wellcraft only put the tube on ONE side of the keel not both. Therefore it is going to collect water no matter what. I garantee you it is soaking into the foam. Vac it out one day and then go back the next day or so and try it again. See if you get more out.
Here is a picture of what I done to mine. This picture is old and no updated, but you get the idea. The red line show how the factory 3/4" pvc WAS. The yellow lines show where I will finish out the fiberglass decking over the center of the keel and into the front stringer. The material I used is 1/4 bulletproof woven glass, yeah its overkill but I got it for free from a buddy who installs glass. 1000.00 for a 4x8 sheet. :o
I then just glassed the edges in and now there is a drain underneath the whole width "about 12" and the tank will foam in on top of the "deck" I built.
Looking towards the stern:
Note how when I am done the ONLY way for water to get into the tank area is through the floor hatch or fuel sending unit access. This is why I MUST keep these areas sealed. That little pipe from the factory isnt big enough for any trash to get through anyways and was a doomed failure from the start because as soon as it clogs and backs up it goes into the tank area. :(
These pics and others are in my gallery.
http://www.wellcraftv20.com/gallery/...umName=album75