It's a 2000 jeep cherokee I6. It started to happen like 3 weeks ago. I since then I replaced my battery, and starter. My alternator was changed in December..my friend yesterday said it could be the fuel pump but I don't know how to figure that out. Plus if it was the fuel pump wouldn't it be stalling out? When it does run. I just need some ideas/help to diagnose the problem.

 

What kinda noises does the Jeep make when you try starting it, like can you hear the fuel pump before actually cranking it? And is it actually cranking?

 

Surly one of these has your problem covered: https://www.cherokeeforum.com/search...archid=4563373

 

Give us more info please. No-start scenarios are usually either no-spark, no-fuel or no combustion or timing issues. Your approach to the problem should therefore focus on these things in order to find the cause. Diagnostics before parts throwing!
Like stated above, does the engine crank at all, or do you hear a click only?
Check battery voltage and condition, have the batt load tested in case of doubt
Check for spark (do a search on how to do this)
Check if the fuel pump 'primes' > listen to it 'prime' in the back when you turn the key to the 'on' position (not start position)
If so, check fuel pressure with a gauge at the fule rail test port.

There are many many causes for a no start, so systematic approach is needed.
Also, if you have a automatic, check if your Neutral Safety Switch is working as it should.
Let us know how you go (but do a search here for no start situation, there is a LOT of info already)