If you wish to run a generator on propane or natural gas, it is always better to consider buying a dual fuel unit. If a unit is not dual (or tri) fuel, it means that it was only designed to run on gasoline. While you may find third-party conversion kits, we cannot recommend them. Such kits will modify the unit’s fuel system, which will most likely void your warranty. Additionally, such modification could lead to a violation of local/federal emission laws.