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Is your Dauntless a center console or a dual console model?
I had the exact same problem with my 1995 Dual console.
I found a 3/4" pvc pipe that goes from the tank cavity to the aft floor compartment that was packed full of leaves.
Also the utility tunnel drains to the rear starboard side box. If this is plugged it will also fill up and overflow into your tank compartment.
Good Luck,
Carter