Generator Conversion Kits to Propane and Natural Gas.
Amazon.com : Tri-Fuel Propane Natural Gas Generator Conversion EM7000IS Alt Fuel Green : Patio, Lawn & Garden
K9568 - DEDICATED (PROPANE OR LP NATURAL GAS ONLY, NO GASOLINE) UNIVERSAL CONVERSION KIT FOR LOG SPLITTERS/GENERATORS/PRESSURE WASHERS FOR ENGINES ABOVE 5HP - Motorsnorkel by US Carburetion