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Tim, when you find the right part numbers please let us know. I have the 12 gallon Moeller tank as well. Currently just connecting the fuel line direct to the fuel filter on the engine and plugging the hose when not in use (99.9% of the time). I too would like to incorporate the old mercury fittings. At least until I start using the onboard tank but that likely will not happen until 2015. The merc fittings should be enough to supply fuel to a thirsty 225 hp Yamaha 2 stroke right?