Fuel Line Pressure Inspection

Disconnect negative battery cable.
Release fuel system pressure. See RELEASING FUEL SYSTEM PRESSURE .
Install SST (OK2A1 131 001) to service port located on center of the fuel rail.

Fig 1: Illustrating SST (OK2A1 131 001)
Courtesy of KIA MOTORS AMERICA, INC.
Connect negative battery cable.
Connect data link connector terminals FUEL PUMP and B+ with jumper wire.
Turn ignition switch ON.
Inspect the fuel line pressure.
Fuel line pressure:

46-51 psi (320-350 kPa, 3.2-3.5 kg/cm ² )

Pressure too high:
- Check for restricted fuel return line
- If line is clean, replace pressure regulator
Pressure too low:
- Block return line and check if pressure rises
- If pressure does rise, replace pressure regulator.
- If pressure does not rise, measure fuel pump maximum pressure.
Turn ignition switch OFF and remove jumper wire.