Well it is possible you did not get all the water the first time?
Also it might have been getting in the sending unit hole?? was there a gasket on it before you sealed it?
On mine, (1975) it was the vents being to low on the sides and when going thur the water the splash would push water in the vents. Just relocated them no more problems!
Could be a cracked gas tank or someone screwed something to the deck and into the tank? Been done before!
But I would check all other stuff before you have to get to the tank as you said its going to be a PIA!!
Good Luck
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1986 V20 
Old Fishermen never die, we just SMELL that way!!
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