Do you mean fuel sender? If you do it's located in the fuel tank and is a complete unit (pump & sending unit).
You need to drop the fuel tank to gain access to the sending unit assembly.
All fuel sending units would be found inside the fuel tank.
Inside the fuel tank
Probably your sending unit in the tank is bad.
Inside the fuel tank combined with the fuel gauge sending unit
probably the sending unit. unfourtunatly the sending unit and fuel pump are made in one peice, so expect it to be expensive
you drop the fuel tank and replace the sending unit
The fuel tank has to be removed to gain access to the fuel sending unit. The fuel sending unit and the fuel pump is replaced as a unit.
It is inside of the fuel tank. You will have to remove the tank to service it.
Inside the fuel tank. Common on most new cars.
In the tank, it's called a fuel pump module.