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You need to do a full inspection on a new-to you boat prior to using it. Regardless of what the prior owner said they did. Especially if it is a "family" boat. Just because a mechanic changed a part does not mean he "solved" the problem.

If it has the fuel smell, do NOT use it till it is accurately diagnosed and fixed.

There is always at least one story in the media each year of a boat exploding after filling up or while underway due to a fuel leak.

You don't want to pour water into the fuel tank cavity since it will not completely drain. You want to lift the inspection ports and let the water/moisture evaporate. You also need to dispose of the gas/oily bilge water properly and not dump in the lake or ground.

Check/Replace the fuel fill, vent and feed hoses. They should be alcohol resistant.

FWIW, The GTX is an Outrage 18 hull with a different liner and cap. It also has the I/O well and modified fuel tank cavity.

Have your brother in law and other family who will operate the boat register here and do some reading to learn more about your fabulous boat.