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The problem has to do with the gasoline powered boats had galvanized tanks. The diesel fuel will chemically react with the galvanizing and dissolve it, depositing a zinc compound in the bottom of the tank.
This in effect, removes the corrosion protection that the galvanizing supplied plus contaminates the tank with an ongoing supply of crap that will plug the fuel filters in addition to having a chemically altered diesel fuel.
The original diesel tanks supplied by Chris-Craft were made of monel.