My 2003 kia turns over but will not start, it ran good earlery

Neutral safety switch might be bad.

I have same problem but only affects my passenger side low beam. I have replaced bulb many times, checked wiring, socket, dealership can\'t figure it out.. Is just one of Kia\'s little quirks. I drive with high beams and fortunately they are dim enough that no one complains. Some times u just gotta put up with it! Good car otherwise

Intermittent problems like yours are VERY difficult to fix. Afraid you need to take it in to a mechanic. But then, you can't start it, so need to pay someone to go to you.

No this does not affect the fuel pump. It will affect the spark though. Hit the gas tank in the center a few times. If it starts then replace the fuel pump. Unfortunetly pumps with a few yaers on them will die when ran out of gas. If it doesn't start pull one of the spark plug wires, insert a screwdriver and put it close to the engine. crank the engine and watch for a spark. if there is no spark then replace the crank shaft sensor. before you replace the fuel pump.

You might have a fuel pump problem after running out of gas. Fuel pumps use gasoline to stay cool, and when there is no gas they can overheat. Also, a good way to tell if your fuel pump is running, is to turn the key to the "run position" ( right before the car starts) and listen for a humming/buzzing sound coming from the fuel tank.
Matt

Get out and push..

COULD BE BAD FUEL PUMP RELAY.SCAN IT FOR FAULTY.SCAN FOR FAULTY CRANKSHAFT SENSOR OR PCM CODES.

Replace the coil for number 3 cylinder.

2002 kia optima has no fire to the spark plugs
or spark plug connector

Did you try changing the Fuel Filter?  That did it for my Kia Sorento 2004.