My 2013 Kia Optima LX lost power doing 75 mph on the freeway. No Acceleration, just completely lost power. After barely getting across to the shoulder had it towed to my mechanic. After reading a lot of post about others losing power I feared the worst. Engine failure or something else major. Turned out to be the fuel pump. Pretty cheap (compared to other things), and simple fix. Installed new fuel pump, and back on the road, pump seems to be working good. One problem I have though is the gas guage does not appear to be working. It is pegged on full and not going down. On the display I have miles till empty which appears to be working correctly, but actual gauage is not?? Just wondering if any idea on how to fix? Still need to check for lose wires on newly installed pump.