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What is the year, make, model and engine size of your vehicle?
2003 mitsubishi outlander 2.4
DTC P0181 may set be due to incorrect resistance in the fuel level sending unit thermistor circuit. If your scan tool that you used can read pids or live data park the vehicle in a garage if possible overnight so the temperature of the fuel in the tank is the same as the ambient temperature inside. These are the readings you should get.
0 C (32 F) = 2.7 - 3.1 V 20 C (68 F) = 2.1 - 2.5 V 40 C (104F) = 1.6 - 2.0V
If the data list temp is incorrect, inspect the harness at connector D-14 under the rear seat for 5.0 V on the grey/green wire and a ground at the black wire on pin 2. Repair the harness if voltage is not 5V. If voltage is 5V at the harness, replace the sending unit.