What should the Plug gap be for a 99 Kia Sephia and where is the Fuel Pump located on this car?

Most fuel pumps are now located INSIDE the gas tank now from what I have been told.
Otherwise follow the fuel line usually passenger side near rear wheel.

Plug Gap 0.044

Capt rich is right they pre gapped it .044 and say that is it
But the hood sticker says .7-.8 mm

Fuel pump access is under the rear seat, through the access port.
Removal

WARNING: FUEL IS EXPLOSIVE. AN EMPTY FUEL TANK CAN STILL CONTAIN EXPLOSIVE GASES. SUPPLY ADEQUATE VENTILATION TO THE WORK AREA. DO NOT SMOKE AND KEEP SPARKS AND OPEN FLAMES AWAY. PURGE FUMES FROM THE TANK AS SOON AS POSSIBLE.

1. Disconnect both battery cables.
2. Remove rear seat cushion.
3. Disconnect fuel delivery module and tank pressure sensor connectors.
4. Remove three screws attaching access cover.
5. Remove rubber grommet and wires from access cover and remove access cover.
6. Disconnect two fuel hoses from fuel delivery module.
7. Remove six screws attaching fuel delivery module and remove fuel delivery module from fuel tank.
When reassembling, clean and tighten both the battery and the cables.

Plug gap: 0.027 - 0.031 inch (0.7 - 0.8 mm)

If the plugs are NGK, the part number should end with an 8 for .8 mm, other cars use part number ending with 11 for 1.1 mm. Your parts store should not mess this one up and they are pre gapped, I just give them all a visual inspection to insure all the gaps look the same, its more difficult to damage a plug now a days during shipping as opposed to some years ago.