Kia Carnival Manual page 700

Maintenance
NO. ITEM
* 7 Fuel filter
Fuel filter cartridge
* 8
(Diesel)
8 14
The fuel filter is considered to be maintenance free but periodic
inspection is recommended for this maintenance schedule depends
on fuel quality. If there are some important safety matters like fuel
flow restriction, surging, loss of power, hard starting problem, etc.,
replace the fuel filter immediately regardless of maintenance sched -
ule and consult an authorised Kia dealer/service partner for details.
This maintenance schedule depends on fuel quality. It is applicable
only when using a qualified fuel <"EN590 or equivalent">. If the diesel
fuel specifications don't meet the EN590, it must be replaced more
frequently. If there are some important safety matters like fuel flow
restriction, surging, loss of power, hard starting problem etc., replace
the fuel filter immediately regardless of maintenance schedule and
consult a professional workshop for more details. Kia recommends to
consult an authorised Kia dealer/service partner.
Scheduled maintenance service
REMARK