How to remove fuel level sender??

Hi, my e430 fuel level sender is weird, it keeps fluctuating around, the gas always shows a little lower than there actually is in the tank and to make it show the correct level, I have to go in the back seat and start jumping around so it goes back up, as soon as I stop doing that, it will start fluctuating again. Is it faulty or does it just need cleaning? Pls tell me on how to remove it without any special tool! Thanks.