I started out with a 4000 watt generator that was taken out of a motorhome about 15 years ago. It is a 1972 model, but did not have many hours on it. I have had the generator for a long time and finally decided I had to do something with it. I bought a gas tank on Ebay last year to use above it , as the electric fuel pump was bad. I built a frame around it and mounted the gas tank above the generator. The gas tank frame is bolted to the bottom frame if I ever need to take generator off. I attached some wheels so I could roll it around garage and put folding handles on the one end. At first I was going to mount battery on generator end, but decided to mount it above motor. I have some aluminum and spacers under battery for a heat shield. I found out these CCK model generators have a cast iron block, hold 3.5 quarts of oil, run at 1800 RPM. So, it should outlast me. Parts are available at a Cummins dealer and one is close to me. I bought a set of points and condenser for a spare and a can of ONAN green. After setting for I know 15 years, I was leary about the carb. I hooked gasline up, turned gas on. With a big battery it cranked for only about 20 seconds and fired. The generator only puts out 120 volts, but works great too. I was grinning! If you ever run into one of these, with a little effort it can be a great backup for power, for the house or that OWB to keep the pump circulating.