High Pressure Fuel Line

Release the residual pressure in fuel line.
(Refer to the Fuel Delivery System - "RELEASE RESIDUAL PRESSURE IN FUEL LINE ")
Turn the ignition switch OFF and then remove the battery negative (-) terminal.
Disconnect the ignition coil #4 connector.
Remove the high pressure pipe flange nut (A) in order of with the special service tool (B) [SST No.: 09314-3Q100]
High pressure fuel pipe flange nut: 26.5 - 32.4 N.m (2.7 - 3.3 kgf.m, 19.5 - 23.9 lb.ft)

Fig 1: Removing High Pressure Pipe Flange Nut (1 Of 2)
Courtesy of KIA MOTORS AMERICA, INC.

Fig 2: Removing High Pressure Pipe Flange Nut (2 Of 2)
Courtesy of KIA MOTORS AMERICA, INC.
Remove the high pressure fuel pipe function block mounting bolt (A).
High pressure fuel pipe function block mounting bolt: 7.8 - 11.8 N.m (0.8 - 1.2 kgf.m, 5.8 - 8.7 lb.ft)

Fig 3: Removing High Pressure Fuel Pipe Function Block Mounting Bolt
Courtesy of KIA MOTORS AMERICA, INC.