Does Anyone Out There Know What Trouble Code P+1172 Mean? Hypertech Found Code And Fuel Guage Has Not Been Working Properly. Thank You Very Much, Rodney

CIRCUIT DESCRIPTION
The fuel pump is located on the left frame rail between the fuel tanks. The Engine Control Module (ECM) provides ignition positive voltage to the coil side of the fuel pump relay. The ECM energizes the fuel pump relay, which applies power to the fuel pump. Fuel is transferred from the rear fuel tank to the front fuel tank in order to ensure all of the usable fuel volume is available to the engine. This Diagnostic Trouble Code (DTC) sets when the ECM commands the transfer fuel pump ON and a predetermined change in the front and rear fuel level sensors does not occur.

This code will set if you are filling the tanks with the engine running. I would make sure that the truck is off when filling either tank.

The fuel pump referred to in MaxPowers post is the transfer pump that brings the fuel from the rear tank to the front tank. Most confuse that for a lift pump.