Hi - we are new to this board. We have an 04 optima that suddenly died yesterday. After 18 months of running great, it suddenly died and restarterd momentarily. It then quit all together. We went back for it with tools today and it started fine, it ran long enough to get it home (5 minutes) then did the same thing. It has 3/4 tank of gas and the fuel cap is ok. I removed the engine cover and injector manifold cover hoping to find a test port, but didn't find one. Hoped to find fuel filter to replace but can't find it either. Advance Auto sold me a large in-line type filter, I thought I could surely find that, but no luck there either. Acts like it runs out of gas, other vehicles I've had fuel pumps go out on - they wouldn't run at all. If you wait a while, the car will start again and run perfectly for another few minutes, then the trouble starts all over again. I called the Kia dealership and they told me to bring it in - hate to pay a 50 mile tow charge and big bill to boot. Any help would be greatly appreciated. Thanks!