Kia Optima Hybrid 2017 Owner's Manual page 159

Features of your vehicle
Emergency fuel filler lid release
If the fuel filler lid does not open using
the remote fuel filler lid release, you
can open it manually. Remove the panel
in the cargo area. Pull the handle out
slightly.
CAUTION
Do not pull the handle excessively,
otherwise the luggage compartment
area trim or release handle may be
damaged.
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