I've also heard up to $10,000 I'm sure that is what the maximum the courts could charge you but I would seriously doubt any judge would inflict those types of fines unless he was an unfortunate recipient from the smoke stories you hear. One thing I have considered are the diamond plate tanks that look like standard tool boxes, just plumb the transfer tank to the existing lines and nobody's the wiser. I spend about $1000-1200 per month on fuel, so it would be a considerable amount saved. Okay, okay, I now have my nomex coveralls on, so I can endure the flaming I'll probably get for cheating the gov out of tax money!!