Newport 30 fuel tank
Wow! Am I losing my mind or are we not talking about the same boat?
The original fuel tank in my '74 Mk II gasoline was 25 gal and it pretty much filled the original location space behind the motor and under the cockpit deck. The steel tank was glassed into place in a way which led me to conclude it was installed in the shell before the deck and cockpit liner were bolted together. Other than cutting a hole in the cockpit deck, there's no way I could have gotten the old tank out with the engine still in place.
BTW, same with the original holding tank under the V-berth.