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As for the question of "why it appeared" I’m assuming this pressure tank was stored with the cap on tight. My guess is that either the gasket under the top weeped a little fuel mix, or the o-ring on the fuel side of the fitting leaked slightly with temperature fluctuations. The fuel mix followed its natural tendency to wick around and cling to the hoes sitting against the top of the tank. As the gasoline evaporated it left the oil and residue behind on the tank. Many of these tanks weep a little bit. If the cap is left loose, this won’t happen, but then that allows air into the tank, fumes out of the tank, and with air comes moisture…
-Ben
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