A blown fuse *could* be the cause of a fuel gauge issue *indirectly*, but it would be a fuse protecting a larger circuit, not a specific fuse solely for the fuel gauge. You'd need to troubleshoot the electrical system to find the source of the problem. Check the owner's manual for your specific year CJ7 for a fuse box diagram. Common culprits are fuses related to the instrument panel or ignition.
To diagnose the problem:
1. Check the fuel sender unit: This is the most common cause of fuel gauge failure. It's located in the gas tank. Accessing it requires dropping the tank, which is a significant job.
2. Inspect the wiring: Look for broken wires, corrosion, or loose connections between the fuel sender and the instrument cluster.
3. Check the fuel gauge itself: It might be faulty. This is usually the least likely cause unless there's been previous damage.
4. Check relevant fuses: Use your owner's manual to identify fuses related to the instrument panel, ignition, or any circuits that might share power with the fuel gauge.
Remember that without the year of your CJ7, providing more specific fuse box information is impossible. The fuse box layout and fuse ratings varied slightly between model years.
