Just make sure you can fit the tank in and out of the boat through the
cockpit access or the
engine access all the way to where the tank goes getting past all the existing hoses, wires and other obstacles in your way. Maybe a cardboard box made to match the actual tank dimensions will make sure you can even fit the new tank in place. On a
Morgan, that was quite a problem, had to
rebuild the old tank instead of removing the whole engine for access. Measure carefully, may have to spin the tank while down below in crammed quarters, just to get it into place. Secure it very well in it's
cradle; a full tank would generate a tremendous force trying to move around in a seaway. Clean out
ports would simplify
cleaning the tank someday and to not put a
screen strainer on the end of the outlet tube, the
screen will clog someday.