You have a grounded sending unit. If the gauge reads full all of the time then there is a bare wire or the sending unit itself has gone bad and grounded out. I also had the same problem after i swapped my fuel pump with one out of an older car that had been sitting for a couple of years. The float was either stuck or not working i just put the old one back in after i found out that it wasnt the problem with my car.
you should go to a car shop for that one!:)
It's a GM
There could be a few problems....wiring issue, the gauge in the dash has gone bad, or the sensor for the fuel float is bad, id check wiring and the gauge first because sending units are expensive and can be a pain to change
Get a syphon hose
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.
Simple check is to ground the fuel sending wire at the fuel tank.If the gauge reads FULL then it is a bad fuel sending unit and you need to drop the fuel tank to replace it.If the gauge reads empty when you ground the wiring then it means you have a bad fuel gauge.I would lean strongly towards the sending unit be bad my 87 the gauge started reading about 1/4 tank less before it failed.
If the vehicle will stall and will not restart or appears to be out of fuel but the fuel gauge reads above empty, replace the fuel sensor assembly and auxiliary tank fuel level sensor if equipped. if not, replace the instrument cluster.
The sending unit is either defective or it is hanging on something in th tank.
I have a problem with my 2 door Toyota rav4 2002 fuel gauge. it reads empty when in fact it is partly full. When filled up at pumps it then reads only half full. What can I do to fix this.
Its in the gas tank with the sending unit and fuel pump
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