Not sure if they changed to fuel take cover on the deck in 98 , but there is a 12in round deck plate on mine, remove it, the valve is on top of the fuel tank under the 12in cover.
if not done, Get your transon checked, Remove the fuel tank access panel and inspect the tank, lines ect replace thru hulls with ss type if not done already.
if fuel filler, vent and feed lines are original , replace them with new ethenol rest fire safe lines. its a rough job but you wont be sorry, For safety sake anyway.
Check all the under dash electrical line and fuses for corrision.
Easier to see if you remove the capreted panels from inside the cabin right behind the helm.
Probably a good thing to think about doing a makeover of the inst panel and switches.
If your not sure, find a surveyor and have it checked by a pro. It will be money well spent.
I am sure you will get allot of input from the other members as well, welcome to the GW family!
Enjoy you boat! and congrats.