Just started showing empty when I know I have full tank of gas? Before I start ripping things apart wanted to check first, is this the fuel sending unit? Or could it be something else? thanks

Just started showing empty when I know I have full tank of gas? Before I start ripping things apart wanted to check first, is this the fuel sending unit? Or could it be something else? thanks

I would check the connections on back of gauge then if still problem start looking at the sending unit.