Perhaps this can help:
May need to find a shop with an OTC Genisys/Pegisys handheld code scanner or Chrysler DRB scanner to test all the solenoids in the system and monitor the pressure readings from the fuel tank pressure sensor/leak detection pump.
On that note, you haven't dropped the tank recently have you?
His: '00 WJ 4.7 Limited- Zone 4" SA lift, JKS BPE's, 242HD Swap, 18" JK Sahara 'Phone Dial' wheels, 255/70/18 Bridgestone Dueler A/T's
Hers: '03 WJ 4.7 Laredo- IRO 3", 245/75/16 Duratracs, Bilstein Shocks, JKS TB w/KOR Bushings, Rusty's A-Arm Spacer, CORE4x4 Adjustable Front Control Arms, Dynomax Exhaust, RB1 Nav -Coming Soon- Overland Rock Rails