It is likely that your fuel sending unit has gone bad. It is located in the fuel tank. Some tanks have an access hole and others require the removal of the fuel tank to replace it.
Bad gauge Bad float in tank
Your fuel sending unit is not giving the correct reading to your gauge
Either the sensor is broken or Your gaug on the dash is not working.
First check the fuse for the 2003 Cavalier gauge. Next check the fuel sending unit in the fuel tank to insure that its working properly. Check the gauge next, then the wiring for the system. One of these units is causing your gauge to not work.
If your Chevy Cavalier's fuel gauge is not working, it could be due to a faulty fuel level sensor, a broken wiring connection, or a malfunctioning gauge itself. Start by checking the fuse related to the fuel system, as a blown fuse could cause the gauge to stop functioning. If the fuse is intact, inspect the wiring and connections at the fuel tank and gauge. If these components appear to be in good condition, the gauge or the fuel level sender may need replacement.
The fuel sending unit for the fuel gauge would be located in the fuel tank.
fuel sending unit broken wire or gauge is bad
If the fuel gauge in a 1992 Volvo 740 always shows empty and the warning light is on, it could be due to a faulty fuel level sensor in the fuel tank or a malfunctioning gauge itself. Additionally, wiring issues or a blown fuse could also cause incorrect readings. Checking the connections and replacing any damaged components might resolve the issue. If these steps don’t work, a diagnostic inspection may be needed to pinpoint the problem.
Either the gauge is broken or the sender is broken.
the float could stick
fuel gauge not working
There is none. But you can try disconnecting the wiring attached to the fuel sending unit and look at the fuel gauge. If it is giving you an empty reading, the fuel gauge is faulty and should be replaced.