My truck was acting weird last night. I start the truck, turn the headlights on, and the truck just chokes out and dies. Later on I start the truck turn the headlights on the same thing but now all my lights and gauges flickering and going crazy. I check my codes and I have P0463: fuel level sensor circuit high input.

I also have P0155,0135 heater circuit bank 2 and 1 malfunction.

anyone know whats going on?

 

For P0155,0135 are you running cats? if not what did you do with the sensors?
it could be a bad cat, bad sensor, or a burned sensor wire.
https://ls1tech.com/forums/showthread.php?t=42940

For P0463 could mean you need to replace your fuel pump assembly but I'm not sure on that one. Check the ground on the sending unit and fuel pump. sending unit could just be shot.