Check the vent tube and all lines to charcoal canister. The tank is not venting enough, that's why you can't fill it fast. The canister also might be full of gas.
1999 Sport, 4.0 5 Speed, 2.5" RC Lift, 1.25 body lift, MML, JKS Quicker Disconnects, Super35, 4.56 gears, Ected locker,33x10.50x15 BFG KM2's
1999 Sport, 4.0, Auto, 2.5 RC lift, 1.25bodylift,MML,JKS Quicker Disconnects, 33x10.50x15 KM's
2011 Sport, Auto, Terraflex Leveling Kit, 285/70-17's