Re: 24 ft Sportcraft Walkaround with 225 Mercury Outboard.
Well, it's definitely a Sportcraft. It should have an aluminum fuel cell, so the only reason for it to leak would be if it's rusted out. That was probably set up to have 2 o/b's, and not just one, or it was an i/o or str8 inboard, and someone did some modifications.
SC did make that boat with twin 140's in '88. There was also an option for a single. My guess is anything less then a 225 will be underpowered for that boat.
As for the fuel leaking, if it is, it's probably due to ethanol fuel deteriorating the original fuel lines or some other fuel system component. Let's not make this an ethanol thread. It's just that that was is a common issue with boat of that vintage (all my fuel system components have been changed out).