Multiple reasons: Electric fault, Gauge malfunction, float bowl in tank problem, fuse blown....
Fuel level sensor malfunction.
A gas tank can indeed overflow if it is not full. A gas tank can overflow if the pressure inside of it is too high.
Your gas tank is Full 'you have gas' full
The gas tank operates on a vacuum principal and if it's not optimal, then there is a sensor that will activate the check engine light.
How many miles on a full tank of gas for 1997 Chevy Malibu
You can put about a pint in a full tank of gas.
No
For long term storage, keep it full.
How many miles does a full tank of gas get in a 2001 Alero Oldsmobile car
You need to siphon it out. You'll also need several gas cans if the tank is full.
The 1995 Astro van on a full tank of gas can travel for about 500 miles.
It may be a problem with the sensor, which is located in the gas tank itself. If this is the case, the gas tank will have to be removed and exchanged for a tank with a working sensor. Needless to say, this is a job for a mechanic with a lift available.