There is a silver rail that should have a grey plastic cap that unscrews. Take it off and there is a valve just like the valve in your tires. Press it in and see if you get any gas to come out. If you do not then you are not getting gas to the injectors. If you do get gas out of there it may not be enough pressure and you really need someone with a pressure gauge to know if you get enough pressure. Are you aware of the ignition key sequence to get codes? That will help you out immensely if your Jeep can do it as not all Jeeps can pull codes.
2000 Sahara, 3.5" Rubicon Express Lift, 1" spring spacer & 1" Body Lift, 33" or 35" BFG Mud tires, Front & Rear ARB, Rancho 9000 shocks, UCF Ultra High Belly Up