Subaru Subaru Outback 2005-2009 Fuel System Specifications

The 2005-2009 Subaru Outback is designed to run on regular unleaded gasoline with an octane rating of 87 or higher. Using higher-octane fuel is not required but may improve performance in certain conditions. Avoid using diesel or E85 ethanol blends, as they are not compatible with the engine and could cause damage.

The 2005-2009 Subaru Outback requires regular maintenance every 6,000 miles or 6 months, whichever comes first. Key tasks include oil and filter changes, tire rotations, and brake inspections. At 30,000 miles, replace the air filter and inspect the fuel system. At 60,000 miles, replace spark plugs and inspect the timing belt. Always refer to the owner's manual for detailed intervals.

To replace the fuel filter, first, relieve fuel system pressure by removing the fuel pump fuse and running the engine until it stalls. Locate the fuel filter near the fuel tank. Disconnect the fuel lines and remove the mounting bolts. Install the new filter, reconnect the fuel lines, and secure it with bolts. Finally, reinstall the fuel pump fuse and start the engine to check for leaks.

Poor fuel economy can result from several issues. Check for clogged air filters, low tire pressure, or dirty fuel injectors. Ensure the oxygen sensors and spark plugs are functioning properly. If the problem persists, inspect the fuel system for leaks or blockages. Regular maintenance and using the recommended fuel type can help optimize fuel efficiency.

To enhance performance, use high-quality fuel and synthetic oil. Regularly replace air and fuel filters to ensure optimal airflow and fuel delivery. Upgrade to performance spark plugs and consider a professional ECU tune. Maintain proper tire pressure and alignment for better handling. Avoid excessive weight and ensure the engine is properly tuned for peak efficiency.