My fuel hand dropped below empty an gas light came on but it has gas in it

What is your question?

I stopped to put gas in my truck. It was above empty so I put $10.00 in an when I got in the truck my gas hand stopped below empty an my fuel light came on. I put $5.00 more in but the gauges did not change. Can you tell me my problem please?

How long has your 2004 Chevrolet Avalanche 2500 had this problem?

It just started tonight