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The most common reason for the fuel gauge in an Impala to stop at half full is a bad fuel sensor. The sensor is mounted inside of the fuel tank.
If your oxygen sensor stops working the fuel (gasoline) and air mixture will be incorrect. Usually this means your fuel efficiency will decrease -- that is, the engine will burn more gasoline than necessary. It's possible however, if it begins to run too lean (not enough gasoline for the amount of air) it can damage the engine. But, this is unlikely.
The fuel pump may stop working when you hit the ignition due to the mechanical failure.
About 10 seconds after the engine stops running.
Probably the fuel pump.
most likely needa a new cam positioning sensor
in the fuel tank it's part of the fuel pump
probably when the pump stops working! WOW
Perhaps--unless the sensor itself is bad.
One cause of your fuel data system not working is a faulty oxygen sensor. Another cause of your fuel data system not working is a defective ignition system.
it is the fuel level sensor located inside the tank.
Bad fuel pressure regulator, Map. sensor not working or the vacuum line is bad or off of the sensor. You did not say what year it is.