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DO NOT pressure test for leaks when the tank is full of diesel. You are asking for a real mess. If you need to find out right away drain or pump the tank dry before you put pressure on it. Air will find the leak more quickly, and much more neatly, than diesel will.
I would clean the bilge and engine space floor to eliminate any existing fuel; then see if the sheen comes back. If so, from where? the engine fuel connections and lines are more likely than a leaking tank. If it is the tank it will stop leaking when the fuel level drops below the hole in the tank. that should help you find the leak when the tank is empty and you can pressure test it.
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