I have a Generac 4000XL that we use as a backup generator I purchased around Y2K time. I decided that I wanted to convert the generator from gasoline to propane due to the shelf life of gasoline in the tanks and the impact of stored gas in the generator. Our normal process is to buy fresh gas before a weather event. We then run the generator dry after the event and burn the gas in the lawn mower or my motorcycle. A company http://www.motorsnorkel.com/ makes a simple propane conversion kit. It consists of a replacement carburetor gasket with a propane snorkel and a low pressure regulator. The hardest part of the kit installation is finding the right place to put it. I wanted the regulator and hose away from the oil fill port, the oil change port, the exhaust, the pull cord and any common service panels. Routing Issues The snorkel goes between the airbox and the carburetor. You can see my airbox here with the tip of the s...