How do I configure the fuel type on my air-cooled home standby generator?
Most Generac air-cooled units are factory-set for natural gas (NG). Many models also support operation on liquid propane (LP). For supported models, configure the fuel selection during initial setup and verify the control panel fuel configuration is set correctly for the installed fuel source.
For Next Generation series generators, fuel selection must be configured in the Field Pro app during initial setup prior to the first startup using the guided setup process, or in the generator configuration settings. If you need assistance with a fuel conversion, contact a Generac authorized service dealer.
Configure fuel type — Guardian series
To select LP, press and turn the fuel knob 180° clockwise. The knob should then point to the front of the enclosure. On 10 kW models, the conversion knob will be under the mixer rather than on top and will be turned counterclockwise. Fuel selection must also be set correctly in the control panel. See below for more information.
Note: On older generators, the knob can get stuck in place. If this happens, gently tap on it with a rubber mallet or similar tool to loosen and turn. Use caution and do not force the knob.
Note: If the orange lever in the image shown below is not present, then the generator likely does not have this fuel conversion capability, and fuel jets will need to be swapped out.
Configure the Guardian control panel for the correct fuel selection
The control panel will also need to be configured for the appropriate fuel type:
Press ENTER to bring up the main menu.
Use the arrow keys to navigate to the SUB MENUS selection and press ENTER.
Use the arrow keys to navigate to the EDIT menu and press ENTER.
Use the arrow keys to select the Fuel Selection menu and press ENTER.
Use the arrow keys to toggle the appropriate fuel selection and press ENTER.
The generator was configured for natural gas (NG) operation at the factory. The following procedure will enable the generator to operate on LP vapor fuel.
Remove the four 6mm Allen head fasteners and lift the top lid from the generator enclosure.
Remove the two 4mm Allen head fasteners. Lift and remove the rear panel.
Use a pliers to squeeze the hose clamp and slide from the fuel inlet fitting.
Remove the hose from the fuel inlet.
Remove the Natural Gas (NG) fuel jet from the fuel inlet. If the nozzle is found to be inside the hose, remove it with a needle nose pliers.
Locate the fuel jet for propane use (supplied). It has a smaller inside diameter than the NG jet.
Insert the propane fuel jet into the end of the fuel inlet.
Reinstall the hose onto the fuel inlet. Secure the hose with the clamp.
Verify the hose has not been kinked in any way.
Reinstall the rear access panel by hooking it on the top of the unit. Check to be sure the alternator bellow is completely secure around the frame provided on the access panel. Attach the panel firmly to the unit with the 2 shorter Allen screws.
Reinstall the top lid firmly with the 4 long Allen screws.
Can my home standby generator run on gasoline?
No. Generac residential home standby generators are only designed to run on natural gas and liquid propane fuel sources. Any modification or improper changes to the fuel system may compromise warranty: What will compromise the home standby generator warranty?
Generac home standby generators are not compatible with dual fuel carb kits.
Can I switch my home standby generator fuel source back and forth between natural gas and liquid propane?
