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Looks like you have a fuel level wire that has gone to ground or you have a faulty fuel level sensor. Disconnect the sensor at the tank and see if that changes the level. If it does then the problem is with the float level sensor. If it stays at full with the sensor disconnected then somewhere the feed wire has gone to ground.
Sounds like the float is stuck, or corroded. Look to see if you have an access door above the fuel tank. If so you should be able to take out the fuel sender, unstick the float, or clean the sensor, and replace it
The gas tank sending unit has a float on it to register the amount of gas in the tank. The float is probably faulty which will cause erratic readings and is a fairly common issue with some GM units. Replacement of the sending unit should resolve that issue. As far as the coolant temperature gauge, it could be a faulty temperature sending unit or a thermostat that is stuck open or someone removed the thermostat. This will cause the engine to never reach operating temperature which in turn makes the engine run rich and can clog cat. converters and destroy some sensors.
the float assembly is part of the fuel pump assembly and is in the tank. the fuel tank will need to be dropped and call your local dealer to see if they sell the float seperately or as a fuel pump/level sensor assembly.
your gas gauge sensor is most likley the problem on alot of new cars they measure your fuel off an average of were your float is at. like if your not moving it stays in one spot but as you move the float moves and reads the lowest amout that it is averaging and if your float keeps reading low your going to read that you have alot less gas than you really do. have you tried filling the tank all the way and see what it does? if it stays at full until you use some gas and your float starts moving your gas gauge will probley go down in that case its the fuel sensor if this dont help let me know and ill c what i can find out for you
Apparently, you jammed the sensor float attached to the pump which runs the gauge. The float must swing up and down to measure fuel level. That runs a resistor unit which varies the reading on the gauge. It is not doing that.