* Instrument cluster bulb(s) failure: The entire instrument panel uses bulbs or LEDs for backlighting. One or more of these may have burned out. This requires accessing the instrument cluster (usually involving removing the bezel around the gauges) and replacing the faulty bulbs or LEDs. This is a more involved repair and often requires specialized tools.
* Fuse: A blown fuse could cut power to the instrument cluster's lighting circuit. Check your owner's manual for the fuse box location and diagram to find the correct fuse.
* Instrument cluster malfunction: The gauge itself, or the circuitry controlling its lighting, could be faulty. This usually requires professional repair or replacement of the instrument cluster.
* Dimmer switch: Make sure the dimmer switch isn't turned all the way down, reducing or eliminating illumination.
In short: You can't change a single "fuel gauge bulb." Troubleshooting the entire instrument cluster's backlighting system is necessary. If you're not comfortable working with car electronics, it's best to take your Freestyle to a qualified mechanic or auto electrician.
