Jeeps have a part called the crank sensor, when working properly it
senses the electrical feild produced by flywheel. This crank sensor
which is located on top of the tranny bell housing has been known to go
bad. When this crank sensor goes bad the CPU does not get a crank
reference and the computer will not fire the injectors. This crank
sensor will fail under high temps and if it is old will fail also when
cold.
You have to find out if the injectors are getting a pulse when the car does'nt start.
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Since you allready replaced the fuel pump I would verify that you have spark to the spark plugs when it wont start and/or when it dies.Once you have done this send me an ansewer and we will see if we can get to the bottom of your problem.
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