A Ford gas gauge fails when there is either a shortened or opened wire in the electrical system. A shortened wire blows a fuse, while an opened wire doesn't allow any electrical current to reach the gas gauge.Continue Reading
There are two common types of gas gauges. The first is called an analog gas gauge. The analog gauge uses a heated bi-metal strip to move the needle on a gauge. When an electrical current flows through it, the strip expands, dictating how much the needle moves.
Electronic fuel gauges are found on modern vehicles and use an LCD screen to display the amount of fuel left inside the vehicle. LCD fuel gauges use modules to monitor the electrical current that flows through the system to determine the fuel level of the vehicle.Learn more about Car Makes & Models