I'm willing to bet that's my problem. I'd like to give it a shot but am not exactly sure where the edges of my tank are located given I've just acquired the boat this year. Are there any reference points above deck? Also, that must have been one heck of a long 3/8" drill to reach the bottom of the fuel tank compartment, isn't the bottom of the compartment about 12" below the deck surface?
I have heard that water logged foam in parkers and many other boats is a common problem so it's probably worth checking it.
I found the edges of the tank compartment by using the stringer diagram attached below. and i also was able to get some measurements to bulkheads by removing deck plates and using a tape measure to find their location. You might search this forum for more info on stringers. Then i marked the deck and double checked my measurements numerous times and drilled holes thru deck. (I had a friend who does fiberglass work patch the holes afterward).
I actually originally thot the water was trapped in other compartments, especially the one forward and starboard to gas tank compartment, since the list was to that side. I should also note that i was having a problem with overall increased weight of the boat as well (stern heavy). See attached file for location of holes drilled. I believe they were about 1" holes. All other compartments were dry except for the gas tank compartment.
I wished now I had taken pics of the process. Drilling holes in your boat deck is obviously a drastic measure, not to mention down along an aluminum gas tank and clear to the hull but I couldn't think of any other way to remove the trapped water. You should really search this forum for other less drastic methods.
I used a 1/2" bit that was 18" long (with round point not a sharp tip) so it was really obvious when it was going thru foam vs hitting hull. There was plenty of room between tank and starboard bulkhead to do this but the aft foam space hole was very tight. I also had a flex cam I used to help with this. I think i had to use the 1/2 pvc pipe as a drill bit to get the final way to bottom of the midship aft water logged foam.
Again, really think this thru before trying it. Get lots of other advice from knowledgeable folks. I fortunately had that available here to me or I probably wouldn't have tried this. And as mentioned earlier, there very well could be less drastic measures to accomplish removing water trapped in this compartment. Also, you still won't remove all the water logged foam obviously, altho it was surprising how much water i was able to get out over time as it settled back the the low points.