Can you manually open the gas tank cover if the lever does not work?

Yes, you can manually open the gas tank cover if the lever is not functioning. Most vehicles have a manual release mechanism located inside the trunk or near the rear seat. If you can't find it, you can also try carefully prying open the gas cap cover using a flat tool, but be cautious not to damage the cover or surrounding paint. If these methods fail, consult your vehicle's owner manual for specific instructions.