Generac 005222-0 / QT 3.9L 40kW — Reconfiguring the Fuel System (NG to LP)
Adjustments · Fuel system / demand regulator
For the Generac 005222-0 / QT 3.9L 40kW, from the Generac owner's manual.
Applies to: Generac QT 3.9L 40kW, Generac V-type engine
Before you start
- Port 1 is for NG only and Port 2 is for LP vapor only. No provision for dual fuel has been made.
Procedure
- Turn the main gas supply off.
- Remove the carburetor fuel hose from the outlet port (Port 1) of the demand regulator.
- Remove the brass hose fitting from the outlet port (Port 1).
- Remove pipe plug from Port 2.
- Install brass hose fitting into Port 2.
- Install pipe plug into Port 1.
- Connect carburetor gas hose to brass fitting.
- Tighten all clamps and plugs.
- Make sure fuel supply is of the proper pressure and type for configuration.
- Reverse the procedure to convert back to natural gas.
- The Dip switch inside the control panel must be in the LP or NG position when switching to different fuels.
Full service-parts list: Generac QT 3.9L 40kW →
Source: Generac owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.