hey guys im still pretty new to the jeep scene ive had my xj for a little over a month not and i think that theres a leaky o ring where the gas lines come out and everything. ive searched on here and couldnt find anything about it and was wondering if anyone could tell me how to replace it. by the way ive got a 1991 xj 4 wheel drive with the 4.0 HO motor

 

to replace the seal you will need to drop the tank on a 91.
unless you are sure where the leak is coming from I suggest you have a shop do a smoke test to find exactly where it is,my 89 was on the return line where it enters the tank,