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I'm seriously considering removing the 10-year old 38 gal tank & replacing it with the 46 gal tank, has anyone done this? How major of a job was it? It looks like it will fit just fine and the fill, vent and engine supply hose will require no mods (nipples are at the same locations & same angels). May need to do something with the return hose, but doesn't look like a show stopper. Biggest issue as I see it is the newer boats don't have a liner under the tank, but hull 600 does. In #600, the tank is bolted to the liner. In the newer boats, looks like it is glassed right to the hull, something I'd rather not do, but so far, don't see any other way. It still looks like the bigger tank will fit, even with the liner. Another possible issue is squareness of the top of the tank with the waterline. I want to be sure it is parallel to the waterline without any shims (want it to rest right on the liner). The old tank is still perfectly good, just looking for a bit more capacity. One other advantage of the newer tank is a second engine supply/return nipple, like for a diesel generator (which I don't need at this time, but may be a nice feature some day). Another attraction is drilling a new hole for a Snake River fuel level sender while the tank is out of the boat.