91 xj fuel guage off???

alright, i'm a little confused as to the problem, but hopefully you guys can help! replaced the fuel pump 2 years ago, and the fuel guage was off by a quarter of a tank...changed fuel pump labor day weekend on the trail, and now the fuel guage is off by half a tank. i dunno what to try and fix, floater? sending unit? any help would be appreciated!!!





-tried searching, but after 25 pages still couldn't find anything relevant...

anybody have any ideas??