I have a continuing fantasy about owning a 32'-38' trawler. One of the common problems in a vessel of a certain age and price range are leaking diesel fuel tanks. The proper repair is to pull the engine (the tanks are generally on either side of the engine, requiring getting the engine out of the way), and replace the tanks. The cost of doing this approaches the price of the boat. Is anyone aware of a reliable method of tank repair in place?