If you mean the average fuel economy display: The procedure varies slightly depending on the specific trim level and radio/instrument cluster setup, but generally involves holding down a button on the instrument cluster while turning the ignition on or off. Consult your owner's manual for the precise instructions.
If you mean a fuel gauge problem: A stuck or inaccurate fuel gauge is a separate issue and requires troubleshooting. This could be a faulty fuel level sensor, a problem with the gauge itself, or even a wiring issue. This is not something you reset; you need to diagnose and repair the underlying problem. A mechanic would be needed to address this.
In short, there's no "fuel reset" button for the fuel system. If you are experiencing a problem, please clarify the specific issue you're encountering (e.g., inaccurate fuel gauge, wanting to clear average MPG), and I can give you more specific advice.
