diy for fuel sensor replacement

[j0nblayz]

hey guys, so it looks like my fuel sensors are done, been acting funny once awhile, and now its just messed up. I'll be empty and it'll show still half tank, i fill up and shows only a 1/4 tank. After driving few days it might go up to full tank, then next day drop to 1/2 tank.

Anyways im thinking of replacing the units myself, has anyone tried replacing the fuel sensor units? i know theres 2, 1 on each side under the back seat. Do i need to empty out the tank first? is it pretty much take the screws out from the top and replace unit?