My buddy just bought an old Mustang. I went over to see it and it wouldn't start. It was running great many times before I came over. He was ready to tear it apart looking for a failed part. The gas gauge was showing half a tank. Not sure if it was accurate or not, we first put some gas in it and it started. I was trying to make a point of keeping it down to the basics because we often overlook them, but really I was just trying to be funny. Sorry.