Infiniti QX80 2014-present Fuel System Specifications

The 2014-Present Infiniti QX80 is designed to run on unleaded gasoline with an octane rating of 87 or higher. Premium unleaded gasoline (91 octane or higher) is recommended for optimal performance and fuel efficiency. Using lower octane fuel may result in reduced engine performance and increased fuel consumption. It is important to avoid using diesel, E85, or any fuel with additives not approved by Infiniti, as they can damage the engine and void the warranty.

The fuel system of the Infiniti QX80 requires regular maintenance to ensure optimal performance. It is recommended to replace the fuel filter every 30,000 miles and inspect the fuel lines for leaks or damage during routine service. Additionally, using fuel system cleaners every 15,000 miles can help prevent deposits in the fuel injectors. Always follow the maintenance schedule outlined in the owner's manual and use only approved fuel additives to maintain warranty coverage.

To replace the fuel filter in the Infiniti QX80, first, ensure the engine is cool and disconnect the negative battery terminal. Locate the fuel filter, typically 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, ensuring to catch any spilled fuel. Install the new filter, reconnect the fuel lines, and secure it in place. Reconnect the battery and start the engine to check for leaks.

If your Infiniti QX80 experiences fuel system issues such as poor performance, stalling, or difficulty starting, begin by checking the fuel level and ensuring the fuel cap is properly tightened. Inspect the fuel filter for clogs and replace it if necessary. Use an OBD-II scanner to check for error codes related to the fuel system. If the issue persists, inspect the fuel pump, injectors, and pressure regulator for faults. Consult a certified technician for professional diagnosis and repair.

To optimize fuel efficiency in your Infiniti QX80, use the recommended premium unleaded gasoline and ensure proper tire inflation. Regular maintenance, including oil changes, air filter replacement, and fuel system cleaning, is essential. Avoid aggressive driving habits such as rapid acceleration and hard braking. Utilize the vehicle's Eco mode if available, and minimize idling. Keeping the vehicle at a steady speed on highways and reducing excess weight can also improve fuel economy.