Bob Deering, The fuel is basically siphoned over. The "adaptor" to the 6 gallon tank is made by taking the vent off of a standard fuel tank cap for the Honda, and putting in a small hose barb--about 3/16" internal diameter. As the fuel level of the internal tank of the honda goes down, the vacuum formed pulls fuel over from the tank. It works best, if the tank of the generator is close to full. This is the reason that this system only works for maybe a foot or two of head--3 feet is too much. Most of the experimentation with the Honda EU 2000i is in the RV world and there are entire forms dedicated to its modification. Also two of the 2000 can be tied to gether to give 4000 watts. The weight of the 3000 Honda is 134 lbs--maybe some folks can lift 67 lbs easily, but those of use with damaged backs cannot--(67 lbs being half the weight if two people are lifting). Two of the 2000 weigh 94 lbs. (about 46.3 lbs each)--yes, the 3000 is one Db quieter --I doubt if any one here can tell the difference. The electric start is certainly a nice feature--but not worth either the weight or cost to us. I just started my 2000 after it had been sitting for 6 months--the second pull started it. My 30+ year old 500 watt honda usually takes 3 to 4 pulls when it is started once a year.... I certainly agree with Loyd about outboards--and that is why we currently only have outboard powered vessels. I have well over 100,000 miles in diesel powered boats, and they certainly have their advantages, but it is not in relitatively small catmarans. The I/O is the worst of both worlds in our experience. Running them with the leg raised is a problem, because it stresses the gimble bearings (like a universal joint)--they have the same problems of difficult service as the inboards in the narrow hulls, and they are impossiable to get fully out of the water. We have to deal with a shallow sand bar getting to our home dock parts of the year, and tried an I/O for several years--it was not a good experience. Incidently there was another recent posting of a Honda outboard having over 4,000 hours with no major service done. Of course these are commercial engines which are meticilously cared for. 14 years ago I met a commercial fisherman who had a couple of 200 hp outboards on his 62 foot fishing boat. I asked him why? He said he could not afford the diesels, and considered the outboards an expendiable item. He was just going to use them for one year, until he could afford the diesels--it turned out he used them for 3 years and they were still going strong. I do believe that 62 feet is well beyond the practical limit for diesels, and the there are certainly advantages to diesels in larger boats--but it shows that the outboards can do the job if necessary.