Time to use a video camera and inspect the tank location. Drill a hole in the floor, insert the camera probe and look around. About $67 @ Harbor Freight.
Or, you can drain the tank and then float the boat and see if she still lists. if she does then it's probably not your tank. if all or most of the list is gone then it probably is the tank. 
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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