Kia Optima: Fuel Filler Cap. Description and OperationDescription
A ratchet tightening device on the threaded fuel filler cap reduces the chances of incorrect installation, which seals the fuel filler. After the gasket on the fuel filler cap and the filler neck flange contact each other, the ratchet produces a loud clicking noise indicating the seal has been set.

InstallationOperation of the rear parking assist system
Operating condition
This system will activate when backing up with the ignition switch ON.
The sensing distance while the rear parking assist system is in operation
is approximately 120 cm (4 ...
Cruise Control
The cruise control system allows you to program the vehicle to maintain a constant
speed without resting your foot on the accelerator pedal.
With cruise control, you can set and automatically maint ...
Fuel gauge
The fuel gauge indicates the approximate amount of fuel remaining in the fuel
tank. The fuel tank capacity is given in section 8. The fuel gauge is supplemented
by a low fuel warning light, whic ...