Generac — Reconfiguring the Fuel System (NG to LP)
Adjustments · Fuel regulator
From a Generac owner's manual covering: GT-990, Model 004666, Model 005011. Check it applies to your exact model before use.
Applies to: Generac GT-990 engine
Before you start
- DO NOT remove the set pins from the regulator housing; this will void the warranty.
Procedure
- Turn off the gas supply.
- Open the roof and remove the door.
- Remove the battery (if installed).
- Remove the engine air in baffle on the left side of the battery compartment.
- Remove the small hose clamp and hose from the fuel regulator.
- Remove the small brass hose fitting from the regulator casting.
- Place the small fuel jet, thread side first, into the threaded hole.
- Thread the small fuel jet into the regulator casting with a short No. 2 Phillips screwdriver.
- Apply thread sealant and replace the hose fitting into the regulator body.
- Re-attach the small hose and hose clamp and tighten.
- Replace the engine air in baffle using the four M6 screws.
- Identify both brass adjustment screws on the regulator.
- Turn BOTH adjuster screws 1/2 turn clockwise to set for LP.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Fuel pressure of 10 to 12 inches water column (0.36 to 0.43 psi) must be supplied
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.