What are some potential causes of a malfunctioning fuel gauge on a Vauxhall Corsa?

The fuel gauge on my Vauxhall Corsa seems to be displaying inaccurate readings. What could be causing this issue and how can I troubleshoot it?

This issue could be caused by a faulty fuel level sensor, a damaged wiring harness, or a problem with the gauge itself. I recommend checking the wiring and connections first, and if those are in good condition, then a sensor or gauge replacement may be necessary.

Another possible cause could be a clog or blockage in your fuel tank or fuel lines. This can prevent the fuel from reaching the gauge properly, causing inaccurate readings. Try cleaning out your fuel tank and lines to see if that resolves the issue.

If you recently installed any aftermarket modifications, such as a new stereo or alarm system, they may be interfering with the fuel gauge's wiring. Check for any loose or crossed wires in that area and make sure all connections are secure.