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Okay, the possibilities are great. need to narrow it down a little.
If it fails to crank over it is likely the battery.
If it cranks over ok, but fails to start it is either lack of fuel or lack of spark.
the Quickest way to identify lack of fuel or lack of spark is to spray in a 2 second dose of starting fluid into the air intake. If it fires up then dies in this test it is lack of fuel most common suspect is fuel pump relay or fuel pump.
If it fails to fire up on the starting fluid test it is lack of spark. Electronic ignition trouble shoot procedure from your shop manual for your VIN number will be required.
what motor? is the coil producing spark?? If so, check the fuel pressure, if the fuel pressure is low drop the tank, repace the pump and also replace the filter (located on the frame forward of the tank). If the coil is not producing spark, check for shorts or opens in the circuits as well as the IGN fuses. If there is NO fuel pressure at all check the fuel pump fuses and make sure the fuel pump is plugged in and there are no opens in the circuit
Most often a relay will act like a buzzer if it is not properly grounded. The ground signal generally comes from the computer. The auto shutdown realy feeds the fuel pump relay and therefore is shutdown relay isn't getting the proper signal it will in turn send same improper signal to pump relay. I am sending you a decent diagram of this and suggest you first make sure all body grounds are clean and secure. http://www.scribd.com/doc/18999822/Jeep-Wiring-2 Good luck!
You may have to prime the fuel pump. Or replace the fuel pump if that does not work. Why do you let it run out of gas? This is definately not good for an injected motor. It will continue to cause more and more problems. Fuel injectors should never run dry.
Sounds like a poor connection somewhere...Best time to check is when it's in no-start condition...When running, obviously whatever isn't working is (temporarily). Once you identify the system (fuel, spark etc) that's not working, check all wires and connectors for good contact and continuity.
i would suggest checking to see if you are getting fuel by disconnecting the fuel line at the fuel rail and turn key if no fuel then its either fuel pump or fuel filter. if you get fuel then it would be the spark
try turning the ignition key on and off two or three times before cranking. If it starts right away your fuel pump in the tank is starting to go bad. a pressure tester can be hooked to the fuel rail to see if pressure is coming all the way up on the first turn of the key
hi ,here is a list of sugestions,check for spark at the spark plug wires ,check fuel presure,try spayng a little starting fluid by the air cleaner if it starts or try to start you may have a bad fuel pump,if is not spark ,check for a bad ignition module.Good Luck