01 s10 gas gauge goes either full or empty

hi,

sounds like the sending unit rheostat(sending unit) has a bad contact or break in the resistance wire. inside the tank theres a float attached to an arm that goes to a small rheostat, like a volume control on a stereo. the rheostat is sending a scratchy signal or no signal to the computer and your getting these readings. that part is inside the gas tank, the part usually comes integrated with the fuel pump. the gas tank has to be lowered to fix it.

jm

With the gas gauge not working right, you have probably never let it get completely empty. And as far as the gas gauge goes, it's probably the fuel level switch. you can not purchase these separate from the sending unit. It would be a $500.00 + I would live with it untill the pump goes out, because this is part of the sending unit also.

faulty feul sending unit or bad ground will need to use a meter to test the system

sounds like you have a restriction in the fuel inlet pipe,( maybe air locking) also your tank sender unit neads replacing to fix you gauge fault, or it maybe that it has something that is not alowingf it to move freely inside the tank, have a good look inside when low on fuel. through the hole where the sender is fitted.

It sounds like the fuel sender is bad in the fuel tank.

Sounds like a bad sending unit or a bad gauge. All 2000 an later GM vehicles seem to have problems with their gauge clusters. Hope this helps.

your gauge is part of the integrated unit in the fuel pump module

I am very familiar with this problem, u will need to replace the gas gauge sending unit in the fuel tank.

The sending unit in your tank is bad replace it.

fuel sending unit trying to go out .