It will turn over it would not crank chech the fuel pump is ok &timming belt too what else can be 2006 kia optima

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Kia Optima Engine Timing Belt Kit With Water Pump

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Well , it's probably missing one of three thing's , spark , fuel or compression ! Now you need to find out which one , pull a spark plug wire an hold a screw driver in the end of the plug wire an hold it close to ground an have someone crank the engine over ! don't hold the screw driver by the metal , you don't won't to get zapped . If there is spark spray some carburetor cleaner into the engine at some point ,vacuum hose ,air intake , the throttle plate would be best , there is usually a black tube going from the air filter box to the engine ! A couple of clamps holds it on , take it off an the engine side you should be able to see the throttle plate ! If it tries to start after spraying carb. cleaner in , you have a fuel delivery problem ! Fuel pump relay , fuel pump driver module or the fuel pump it self is bad ! Now if you have spark an sprayed carb. cleaner an it did not try to start you need to check engine compression ! The timing belt may have worn enough for it to jump time a little causing it to be out of time ! Back in the 80's the little cogs on the belt would wear off an the cam shaft wouldn't turn . Back then it was easy to check by taking the distributor cap off a see if it would turn while cranking the engine !

If the engine cranks the starter is doing its job.
You would need to check for fuel pressure at the injectors.
Its possible the pump was clogged up or overheated when you were driving it low on fuel. The gasoline keeps the pump cool and lubed.
The only fuel filter for your model is inside the gas tank.

not sure on model but most new cars if you jack up the car and remove the drivers side wheel right hand drive uk you should be able to get at it from there the timming cover may have to come off and some times the timming belt has to be loosend but as long as the timeing doesent get moved it should be ok to do its only if any thing on the engine part gets moved either the crank or the cam shaft parts move then the timeing will have to be done again hope this helps ivan

indicates a failed timing belt
do a physical check that the rockers are moving when cranking the engine over

always check the simplest things first. is it getting spark? if so, is it getting gas? if so, is it getting enough gas? and so on...

I had 2006 kia optima 2.4 liter LX, I drove 150000 miles plus, it was over 100,000 miles I changed timing belt, and AC belt, alternator belt is still ok, but it was my fault, I did not change crank shaft balance belt, it next to timing belt, this very important, timing belt and crank shaft balance belt must change same time, you set all mark the same positions, you can see all clear marked
if you had OBD2 scanner is helpful to read all faulty codes if you do it your self repair
if you have any problems about KIA optima, please post on any websites, to share some ideas to other KIA optima owners, like me, I change oil every 2500 miles to make my optima runs smoother
automatic transmission fluid change every year if you put high mileage on your car, optima had hard time to find it own part some time, radiator hoses are still good condition and had hard time to find in any auto part stores in my home town, good luck and thanks for sharing.

your cam must be busted by a new cam probably not enough fuel caused buy sloppy timing

The thing is your doing the timing belt the water pump is right their with it . it should cost you much more at all besides the cost of the water pump. When doing a timing belt I have a rule that I go by The timing belt/seals =cam , crank , any pulley & tensioner & water pump all get replaced at the same time. I did a t-belt on a Audi A-8 very complex whole front of car has to come off as well, he didnt want to do w-pump & thermostat his thermostat was their as well not even a month later the water pump gave out he had to pay double the price because he didnt want to do it when I had it apart the first time. And make sure mechanic is ase certified . good luck

This could be multiple issues.
1.) timing belt
2.) Crank sensor
3.) Fuel pump (although usually they do not just die they get weak)

Check these let me know.