It want crank by the key I cross the relay and starts but only runs for a few sec

https://www.youtube.com/watch?v=McnXLcJNVfI&t=798s

First off you have no clue how complex the starting system is on your vehicle . Suggest you buy factory service repair manual an read up on the starting system on your vehicle . A lot of thing's can keep the PCM/ECM from energizing the starter relay .Do you know what happens when the key is turned to the start position ?
Circuit Description (ECM/PCM Controlled)
Moving the ignition switch to the START position sends a 12-volt signal to the engine control module (ECM)/powertrain control module (PCM) Crank Request circuit. The ECM/PCM verifies that the transmission is in the PARK or NEUTRAL position. With the transmission in Park, voltage flows through the Park/Neutral position switch and feeds the starter relay coil. The PCM then grounds the control circuit of the starter relay. When the starter relay is energized it allows battery positive voltage to the starter solenoid S terminal. On some vehicles the starter will continue to crank the engine with the key released until it starts or the crank command has timed out to prevent excessive heat build up in the starter circuitry or the ECM/PCM receives an engine run flag.
Circuit Description (BCM Controlled)
Moving the ignition to the START position signals the body control module (BCM) that engine crank has been requested. The BCM verifies that theft is not active and sends a serial data message to the powertrain control module (PCM) requesting engine start. The BCM also energizes the RUN/CRANK RELAY. When the RUN/CRANK RELAY switch side closes, and the vehicle is in Park or Neutral or with the clutch is fully depressed, if equipped, supplies voltage to the starter relay coil. The PCM verifies the transmission is in Park or Neutral and the clutch is fully depressed, if equipped. The PCM will then ground the control circuit of the starter relay, closing the switch supplying voltage to the starter solenoid. On some vehicles the starter will continue to crank the engine with the key released until it starts of the crank command has timed out to prevent excessive heat build up in the starter circuitry or the PCM receives an engine run flag.

Your best bet , take it to a qualified repair shop before you short out a control module.

Check fuel pump fuse.

I understand you replaced the relay but not the pump, right ?
Has the fuel filter been replaced recently ? Are you sure there is gas in the tank ?
You should be able to jumper the pump relay and check fuel pressure.

Doesn't that jeep have an on board anti theft system that shuts of power to the startee and the fuel injectors. Im pretty sure it does thats where to start sometimes just turn the key to the on position for 30 sec. To 60 sec then crank the engine if that doesnt work turn off at least 10 sec try again tirn to on position without cranking motor for at least 30 sec then try cranking

test replace the fuel pump relay, make sure the relay socket has 12 volts to 2 of it's terminal when the key is held in crank position, if not you may have a defective ignition switch or Powertrain control module (PCM)

every key cycle(5 secs appart) will turn pump on for 3 seconds.This is done to insure pressure at the injector when cranking,otherwise hard starting would insue.The engine computer drives a relay in the underhood junction box which sends 12 volts to the pump.An audible click of that relay and the pump can be heard key on/engine off for 3 secs via the ignition signal to the ecm which drives the fuel pump relay.

How about the fuel pump relay? or possibly the ASD relay. need to make sure you are getting voltage to the fuel pump when the key is on, the pump will run only for a few seconds when you turn the key to start to prime the system. If you dont hear the pump prime, check the aforementioned relays and associated fuses.

you could have a loose wire connection to the fuel pump. try to see if any wire need to be crimped back on the fp!.

check fuel pump relay/should run pump for two sec when key is turned on. try turning key on but dont crank did pump hum/if it did look towards leaky fuel inj./faulty pressure reg. poss clogged fuel filt.