Generally the fuel gauge sending unit located in the fuel tank is At Fault for incorrect fuel level readings.
The sending unit is either defective or it is hanging on something in th tank.
You might plan to refuel when your fuel gauge reads one-eighth of a tank of gasoline. Some people choose to refuel when the gauge reads one-quarter of a tank remaining.
Bad sending unit. This is what reads the tank level and sends it to the gauge.
Possible a defective sending gauge or float inside the tank.
In most cases the sending unit in the tank is at fault.
You probably have a faulty fuel gauge sending unit.
i would recommend getting gas when that happens. perhaps take it to the mechanic to fix the gauge
In the gas tank
Float could be stuck in the tank or the ground wire on the tank is broke.
you should go to a car shop for that one!:)
Defective fuel sending unit.
It can feel warmer than a half filled tank (especially when it has just been filled) because of all of the molecular activity in the tank and some of this is transferred in to heat energy.. If the tank is left for some time it will drop in temperature to the point where it is similar to the half filled tank. The reason it is warm when it has just been filled is simply down to the hear from the compressor and the friction caused by the air molecules as they enter the tank.