Hyundai Elantra: Removal - Fuel Tank Pressure Sensor (FTPS). Repair 
procedures - Engine Control System - Fuel System - Hyundai Elantra MD 2010-2015 Service manualHyundai Elantra: Removal

1.
Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2.
Remove the rear seat (Refer to "Seat" in BD group).
3.
Remove the fuel pump service cover (A).

4.
Disconnect the fuel tank pressure sensor connector (A).
5.
Remove the fuel tank pressure sensor (B) after releasing the hooks vertically.