S4 Fuel gauge not working.
 

2005 audi s4 Quattro
Hello. My fuel gauge isn't working properly. It powers up but it only shows its at an 8th of a tank. I've already tried replacing the fuel level sender twice. I've tried reseting it by pulling the #15 & #28 fuse a bunch of times. No change.
what do I need to do to repair this issue?
Thank you.