fuel sending unit is bad.
fuel sending relay is bad.
It seems that your thermostat is not opening.
Most fuel gauge problems are the result of a faulty fuel gauge sending unit located in the fuel tank.
change your thermostat....
Might be the fuel pump going out-I had same problem on a 1992 Nissan pickup and the fuel pump started going out soon there after....
1998 Nissan Pathfinder the speedometer and heat gauge quit workin?
you need to replace the gas gauge sending unit in the tank, or your gauge is broken
There is no reset for the fuel gauge. The sending unit in the fuel tank has probably failed.
if its for a pickup then its dirt cheap but finding a seller is harder. and putting the pickup together is even harder.
My 1969 Chevy pickup has it in the fuel tank behind the seat
There is no reset for the fuel gauge. The sending unit in the fuel tank has probably failed.
They are both powered by an 8 volt regulator on the cluster. When that regulator starts going bad the gauges dont get any power and stop working. If you google it it there is a simple procedure to replace it if you are handy with a soldering iron.