Overview Reviews Similar Products –> Product Description Note: The Generac 0D8631 Dual Fuel Regulator fits many older Air Cooled units that had adjustable fuel regulators, most notably the Generac 4456 and 4390. To properly set the fuel knobs, download our Generac Diagnostic Manual and refer to page 111, “Test 63”. Fuel systems that cant maintain steady pressure often lead to sputtering, hesitation, or loss of power just when you need your generator most. The Generac 0D8631 Dual Fuel Regulator helps maintain the correct pressure for both natural gas and propane systems, keeping your unit running smoothly across fuel types. Replacing a failing regulator can quickly resolve hesitation, surging, or uneven engine behavior. A dual fuel regulator controls pressure and fuel delivery from the fuel source to the engine, enabling smooth transitions and stable combustion. When internal components wear or lose calibration, fuel delivery can become unpredictab
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