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  Preventing/Removing collected water in Cavity for Internal Fuel Tank

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Author Topic:   Preventing/Removing collected water in Cavity for Internal Fuel Tank
Jim Bennett posted 10-01-2001 11:27 AM ET (US)   Profile for Jim Bennett   Send Email to Jim Bennett  
Yesterday removed cover (many screws of various types) over the 40 gal internal fuel tank of my 73 Outrage 21 project boat. Cavity containing tank was filled with water which we removed(several gallons) with wet/dry shopvac. One of previous owners must have had similar problem because he had put down a ‘complete” but obviously ineffective globby silicone “gasket" between cover and deck recess. I cannot be the only one with such a problem since most internal Whaler tanks, I believe, are set in a liner embedded in the foam and somebody must have a solution. I have several questions here.

1. Do or did such Whalers have some type of original gasket under cover to prevent water from collecting in cavity?

2. Do I have a drain to this cavity which is plugged or has anyone created such a drain system?

3. Has anyone devised an electrical pumpout system to extract collected water from cavity and pump into bilge and then have bilge pump send it overboard.

4. Finally, what type of screws should be used to hold down cover and how many?

Thanks in advance.

LarrySherman posted 10-01-2001 02:11 PM ET (US)     Profile for LarrySherman  Send Email to LarrySherman     
Jim, I'll be doing the same project this winter on my boat, and am very interested in your progress.

I have a baitwell aft of my fuel tanks, and if I encounter the same water problems as you have, I will proably install a nylon through hull between the two compartments, with a ball valve on the baitwell side.

forespar makes some nice ones, out of "Marlon"

Makaira posted 10-01-2001 05:24 PM ET (US)     Profile for Makaira  Send Email to Makaira     
Jim, I had the same problem on my 1973 19' outrage. Instead of trying to seal the floor board (which is virtually impossible, I decided to install a drain with a brass plug. I decided this for two reasons. First, I knew that over time the floor would leak again no matter how sealant is used, and second, I wanted to know if the tank was ever leaking. What I did was drill a hole at the rear of the tank compartment into the rear well and sleave it with a 3/4 inch PVC pipe. With epoxy I bonded a brass fitting with a screw plug to it and them used epoxy to bond the tube in place. So far it has worked great. I leave the plug out when I wash the deck and any water that gets into the tank cavity drains out in to the well. I can also periodically check for gas fumes to see if the tank is leaking. In addition, I raised the tank up by placing it on 1-inch teak runners so that water can flow under the tank.

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