My skiff has 2 20 gallon plastic fuel tanks under the front deck (casting platform) I do not thing there is any way to remove them without cutting a hole in the deck. They have old stale gas in them. Or at least they smell like they do. Is there a way for me to clean them out so they can be used? Also there is only 1 fuel line running from the front of the boat to the rear where the engine is. So the question is there must be some sort of T in the line where the other tank connects. How would that work? Would both be open to fuel all the time? Or should there be a shut off ?