Kia Cadenza 2017-present Fuel System Specifications

The 2017-Present Kia Cadenza is designed to run on regular unleaded gasoline with an octane rating of 87 or higher. Using premium fuel (91 octane or higher) is optional and may slightly enhance performance, but it is not required. Avoid using diesel, E85, or any fuel with a high ethanol content, as these can damage the engine and fuel system.

The Kia Cadenza’s fuel system requires regular maintenance to ensure optimal performance. Inspect the fuel lines and connections every 15,000 miles for leaks or damage. Replace the fuel filter every 30,000 miles or as specified in the owner’s manual. Use fuel system cleaner additives every 7,500 miles to prevent carbon buildup. Always follow the manufacturer’s recommendations for maintenance intervals.

To replace the fuel filter, first, locate it under the vehicle near the fuel tank. Relieve fuel system pressure by removing the fuel pump fuse and running the engine until it stalls. Disconnect the fuel lines and remove the old filter. Install the new filter, ensuring the flow direction matches the arrows on the housing. Reconnect the fuel lines, reinstall the fuse, and start the engine to check for leaks.

Poor fuel economy or performance can result from several issues. Check for clogged fuel injectors, a dirty air filter, or a malfunctioning oxygen sensor. Ensure the tires are properly inflated and the fuel cap is tightly sealed. Use a fuel system cleaner to remove deposits. If the issue persists, have the vehicle diagnosed by a professional technician.

To optimize fuel efficiency, drive smoothly and avoid rapid acceleration or braking. Maintain proper tire pressure and use the recommended fuel grade. Regularly service the engine, air filter, and fuel system. Remove unnecessary weight from the vehicle and use cruise control on highways. Planning routes to avoid heavy traffic can also improve fuel economy.