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I don't think it would throw a code for either of the 2 possibilities, I may be wrong about that. My suggestion would be to get a junkyard gauge and try that 1st. It's easier that checking the float sensor in the tank.
I have the same thing happening in my 98 Silverado, had the fuel pump and sending unit replaced a while back when it went bad, (The pump), never fixed it. Even switched the cluster, that didn't fix it.
Did you happen to find a solution yet