1. Simple Checks (Easiest First):
* Low Fuel: The most obvious! Try adding a few gallons of gas. Sometimes, the gauge is simply at the very bottom of its range and hard to read.
* Loose Connection: Check the fuel gauge wiring connectors at both the sending unit (in the fuel tank) and at the instrument cluster. Look for corrosion, loose wires, or broken connectors. Wiggle them gently to see if the gauge flickers.
* Blown Fuse: Consult your owner's manual to locate the fuel gauge fuse and check if it's blown. Replace it with a fuse of the same rating if necessary.
2. More Involved Checks (Requires Some Mechanical Skill):
* Fuel Level Sending Unit: This unit, located in the fuel tank, sends a signal to the gauge based on the fuel level. A faulty sending unit is a common cause of inaccurate or non-working fuel gauges. This requires dropping the fuel tank to access and replace it – a fairly involved job. Testing the resistance of the sending unit with a multimeter (while the tank is down) is the best way to confirm its condition. Resistance should change as you move the float arm by hand.
* Instrument Cluster (Gauge Cluster): The gauge itself could be faulty. This is less common but possible. Testing the gauge directly would require removing the instrument cluster and using a multimeter – a more advanced repair.
* Wiring Harness: There might be a break or short in the wiring harness between the sending unit and the instrument cluster. This requires careful tracing and inspection of the wiring.
3. Professional Help:
If you're not comfortable with the more involved checks, it's best to take your Cavalier to a qualified mechanic. They have the tools and expertise to diagnose and repair the issue efficiently.
Before you start any work:
* Disconnect the battery's negative terminal before working on any electrical components. This prevents accidental shorts and damage.
* Work in a well-ventilated area if you're working near the fuel tank. Fuel fumes are dangerous.
Remember to always consult your owner's manual for specific information about your vehicle's fuel system and electrical components. The location of fuses, the fuel sending unit, and other relevant parts may vary slightly depending on the year and model of your Chevy Cavalier.
