Where is the fuel sending unit located on a 1994 4runner SR5 V6? If replacing a rotted out rear fuel line, is there a large chance when removing this line, the sender may get damaged too? I have not dropped the tank yet, just tryin to get a better picture of what the set up will look like

What are some symptoms of an "about to fail" fuel pump? I hasd mentioned in another post that shortly after getting some new gas in my vehicle after the car was sitting on empty the whole night, the car started sputtering...sediment in the line and filter? Or could it possible be the sending unit or pump?

Thanks to all, much appreciated.