Generac — Reconfiguring the Fuel System (7 kW, 410cc Engine)
Installation · Demand regulator / fuel system
From a Generac service manual — check it applies to your exact model before use.
Applies to: Generac GH-410 engine, Generac GT-530 engine, Generac GT-530 engine, Generac GT-990 engine
Before you start
- Use an approved pipe sealant or joint compound on all threaded fittings to reduce the possibility of leakage.
Procedure
- Turn off the main gas supply (if connected).
- Open the roof and remove the door.
- Remove the battery (if installed).
- Disconnect Wire 0 and Wire 14 from the gas solenoid on top of the demand regulator.
- Remove the carburetor fuel hose from the outlet port of the demand regulator.
- Remove the demand regulator by removing the fastener that retains the regulator mounting bracket.
- Remove the square headed steel pipe plug from outlet port #1 and the brass hose barb fitting from outlet port #2.
- Refit the brass hose barb fitting to outlet port #1 and the square headed steel pipe plug to outlet port #2.
- Reverse procedure Steps 1-6 to reinstall demand regulator.
- Take the plastic plug supplied with the generator and press it into the 3/4" hole on the bottom of the air cleaner base.
- Reverse the procedure to convert back to natural gas.
- Check for gas leakage at the pipe plug, hose connection and fittings.
Specs & values
- Propane supply pressure to the fuel inlet must be 10 to 12 inches of water column (0.36 to 0.43 psi).
Source: Generac service 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.