Diesel engine
The water-in-fuel warning light comes on to indicate sediment buildup in the fuel filter. In this case, drain the sludge as follows:
1. Remove the fuel filter upwards by unscrewing the mounting bolt.
2. Drain the sediment by loosening the drain plug at the bottom of the fuel filter.
3. After draining the sediment, tighten the drain plug.
Note: It is recommended that water be removed from the fuel filter by a Hyundai official representative.
Warning: Thoroughly wipe off any drained sludge, as mixture of water and fuel may ignite and cause a fire.