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Thanks for the reply. Here is a pic with my tank installed and all hooked up. Under the tank you will see the strips of Vitone (?) rubber I've placed there. They are gas resistant in case of future spills or leaks.
http://i123.photobucket.com/albums/o3...pqnp2x.jpg

I installed a 1/2 inch hose through the lower hose from the rear bilge that the ground wire usually goes through. This hose is fastened to the Coffin side.
http://i123.photobucket.com/albums/o3...y5jkvr.jpg
The other end of this hose will feed into a 12 volt pump that will drain the coffin for me when ever I need it too.
http://i123.photobucket.com/albums/o3...ac7t9f.jpg
I picked up some Fatigue Mats and will use those to jam in around the sides of the tank. I tested the mats by pouring gas on a piece and it didn't appear to have any effect on it. I then tried lighting it on fire and it would even burn! I will jam in these mats around all sides to keep the tank from shifting around while under way. Thanks