Subaru Subaru Forester 2019-present Fuel System Specifications

The 2019-Present Subaru Forester is designed to run on regular unleaded gasoline with an octane rating of 87 or higher. Using premium fuel is not required but may provide slight performance improvements. Avoid using diesel, E85, or any fuel with more than 10% ethanol, as it may damage the engine and void the warranty.

The Subaru Forester requires regular fuel system maintenance, including replacing the fuel filter every 30,000 miles and using fuel injector cleaner every 15,000 miles. Additionally, ensure the fuel cap is tightly sealed to prevent evaporation and check for fuel leaks during routine inspections. Follow the owner's manual for a detailed maintenance schedule.

To replace the fuel filter, first, locate it near the fuel tank. Disconnect the negative battery terminal, relieve fuel system pressure, and disconnect the fuel lines. Remove the old filter, install the new one, and reconnect the fuel lines. Finally, reconnect the battery and start the engine to check for leaks. Refer to the service manual for detailed instructions.

If your Forester has poor fuel efficiency, check for clogged air filters, improper tire pressure, or a malfunctioning oxygen sensor. Ensure you are using the correct fuel type and avoid excessive idling. If issues persist, have a professional inspect the fuel injectors, spark plugs, and engine control module for faults.

To optimize fuel performance, maintain proper tire pressure, use high-quality fuel, and avoid carrying unnecessary weight. Regularly replace air filters and spark plugs, and ensure the engine is properly tuned. Driving at steady speeds and using cruise control on highways can also improve fuel efficiency.