Fuel Tank Size

[bigeasy1]

As an owner of a 1974 23 Tsunami with an I/O Alpha drive,I can tell you that the fuel tank(original one) in my boat is 55 Gallons.The tank was screwed in by four angle brackets that are welded to each side of the tank,about 3 or 4 inches in from the corners.
There was only a tiny bit of foam holding it in
The tank is clearly marked with the 0.125 thickness,and capacity of 55 Gallons. I forget the manufacturer,but it was made in Hialeah Florida.
Looking from the stern forward,I have the I/O engine box,then the in deck fish/bait box,then the tank,then the long in deck storage compartment,that runs into the cabin.

This was the original setup in this boat as verified by the three previous owners.The original specs show the I/O listed with a 72 gallon tank,but it was not the case with mine.I assume they offered a few tank and hatch versions.