I woke up yesterday to goto work to find that the jeep would just crank, but not turn over. I went out and bought a battery, installed it and it turned over. I thought all was well until today. I woke up to the same thing. The jeep would crank, but not turn over. My brother came over with a jumper/charger for the battery and nothing. We tried jumping it from his car and nothing. I had to have it towed to a garage. The guy said maybe it was the fuel pump. Does that sound right?
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crank and turnover means different things to different people. if it cranks, and cranks anywhere near strong, it is not battery/starter related.
no way to tell what it is if it cranks fine and doesn't start without testing.
could have no spark, no pulse, no fuel or combinations thereof.
could be a coil, distributor, or coil pack (year?), crank sensor, fuel pump, computer, ground/short, and many more.
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ok heres how you test to see why it wont start. its a 99 so it has a distributor rite? motors need 3 things to run: fuel, air, spark. air is simple, unless the timing chain broke (really doubt that and it would have a completely different sound than usual while cranking) its getting air. spark is also easy: pull one of the wires off of a plug, get a good screw driver and HOLD THE HANDLE and stick the end in the plug wire where it connects to the plug. hold the shaft of the screw driver close to something metal and have someone crank it and see if a spark arcs off of the screw driver. if you get an arc you have spark. fuel: get a can of starter fluid and spray a little in the air box while someone cranks it. if it fires up with starter fluid then yes your fuel pump might be bad but it also could be the relay or the fuse or a connection somewhere.
If the gas gauge is reading empty, it may be the following or related to the following. There is a wire connection plug located up near the gas tank. These wires do a number of things, but as I recall the green( 50% sure) one controls the fuel pump. It works its way out and you don't start. Might be worth a check. I have seen it happen 3 times. I had mine pull out on the trail. Fixed it well enough to get back to the hotel.
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About a month ago mine did the very same thing, Even took the battery to have it checked out and it was good. was advised to charge said battery and see what happens. Well turns out and still don't know why the battery needed charging and has been fine since. Just a thought. Oh and when i tried to start it it would crank normal not slow or had any drag.