http://www.kiatechinfo.com/ shows a filter located right behind where you fill it up on the filler tube top it look's like a rectangular filter with a hose hooked up to it if this help's any. My 02 doesn't have it you must have the newer version rio 05-12. Good luck. Reguard's ronjohn
jhudson Look at your date of manufacture on the drivers side door some 05 models are covered by the newer models i guess that's when they switched to the newer model ask your dealer i looked on kia tech 05-12 service did you it's there. The filter is shown for it in that service info as my 02 doesn't have it maybe your's is the newer model. Good luck just trying to help.