Empty fuel light prob.
 

This prob has been going on for as long as i can remember, but why fuel empy light goes on most of the time, its actually more on when its filled up than empty, now i have my guage thats also not working properly (doesn't show me is fully filled) but i don't thikt that should be causing any problems

Check the wire connections on the tank. There are 3, one for fuel level, one for low fuel, the 3rd is ground.