Generac — Reconfiguring the Fuel System (12 kW and 15 kW, 990cc Engines)

Adjustments

From a Generac owner's manual — check it applies to your exact model before use.

Applies to: Generac GT-990 engine, Generac GH-410 engine

Procedure

1. Turn OFF the main gas supply.
2. Remove the engine air in baffle on the left side of the battery compartment (four M6 screws).
3. Remove the small hose clamp and hose from the fuel regulator.
4. Remove the brass hose fitting screwed into the fuel regulator.
5. Locate and identify the brass idle jet in the fuel regulator casting.
6. Remove the idle jet from its holding location.
7. Place the idle jet, thread side first, into the threaded hole occupied by the brass hose fitting.
8. Using a short No. 2 Phillips screw driver, thread the idle jet into the regulator casting; do not over tighten.
9. Apply thread sealant to the hose fitting threads and replace it into the regulator body.
10. Re-attach the small hose and hose clamp; replace the engine air in baffle.
11. Turn the front adjuster screw 1/4 TURN CLOCKWISE to set the system for LP fuel.

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.

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