What you might be looking for is either:
* The trip odometer reset: This resets the mileage counter you use to track individual journeys. This button is usually located on the instrument cluster (the area with the speedometer and other gauges). It's often a small button, sometimes on the end of a stalk, that you press and hold to reset the trip. Look carefully for a small button near the odometer display.
* A fuel gauge issue: If you suspect a problem with your fuel gauge reading inaccurately, there's no button to fix it. The problem likely lies with the fuel level sensor in the fuel tank or a fault in the vehicle's electrical system. This would require a professional mechanic to diagnose and repair.
To clarify what you're trying to achieve, please explain what you're hoping to accomplish by pressing a "reset fuel" button.