Hello & Welcome to JA,
Did you replace the fuel sender assembly ?
Did you closely look at the harness connector terminals to the fuel sender assembly ?
Ok,somewhere you have a build up of high resistance.
Test the ground circuit from the under hood electrical center to G104 located
In the Engine Harness, Mounted on the rear of the left cylinder head.
Test the ground circuit from the fuel sender assembly to G110 located
In the Chassis Harness, Mounted to the front of the left front body mount.
These circuits must test at .002 ohms or lower,if not repair ground circuit.