Gerry if you havent already check out utterpower dot com. Alot of good info on the listeroids. Unfortunately you have to buy a new one as a "repair kit" or air compressor and install the injector due to the EPA outlawing them for import several years ago..
Im planning on powering my shop with one, initially with a 1 phase and as I get equipment in ill upgrade the power head to 3 phase.