What will be the reason why the engine shuts down while driving? The alternator was just replaced because battery light was on the whole day to work one day. Fuel filter been replace about a year ago.

And question two. where is the sensor that controls the gas gauge? and or what will be the reason why the gas gauge never drops below a half a tank? even though I know on average there is only 10-14 gallons of fuel at one time.