* To reset the average fuel economy display: This is usually done through a sequence of button presses on the instrument cluster (the area with your speedometer and gauges). The exact steps vary slightly depending on the trim level of your Explorer. Look for buttons related to the trip odometer or information displays. Consult your owner's manual for the specific procedure. It often involves holding down a button, sometimes in combination with another button, for several seconds.
* To clear a fuel-related trouble code (Check Engine Light): You can't reset a Check Engine Light with a button. If the light is on, it indicates a problem that needs to be diagnosed and fixed by a mechanic or using an OBD-II code reader. Simply resetting the light without addressing the underlying issue won't solve the problem and could cause further damage.
* To reset a fuel pump: This is extremely rare and highly unlikely to be a user-serviceable action. If you suspect a problem with your fuel pump, you need professional help from a mechanic.
In short: Find your owner's manual. It will have the instructions for resetting your average fuel economy display if that's what you want to do. If you have a Check Engine Light related to fuel, don't try to reset it – get it diagnosed.
