The sending unit in the fuel tank is probably bad.
what engine?
low coolant
Most likely it is the fuel level sender in the fuel tank. I have seen many of them go bad. the tank will have to be dropped to do this
www.the12volt.com
.060"
13.5 quart system
A 2001 S10, regular cab, pickup, 2.2L engine, has a 18 US gallon capacity fuel tank.
passenger side by the oil pan in front of the transmission
Drop the fuel tank or remove the bed.
Follow the positive battery cable from the battery, it will lead you right to the starter.
the sending unit is attached to the fuel pump in the tank.
Hot at idle, 20-30 psi.