Buick Enclave 2018-present Fuel System Specifications

The 2018-Present Buick Enclave has a fuel capacity of 19.4 gallons (73.8 liters) for the standard model. It is equipped with a 3.6L V6 engine and is designed to run on regular unleaded gasoline with an octane rating of 87. However, for optimal performance, 91-octane fuel is recommended. The fuel system is compatible with E85 flexible fuel, allowing the use of up to 85% ethanol blends.

Regular maintenance for the Buick Enclave's fuel system includes replacing the fuel filter every 30,000 to 45,000 miles, depending on driving conditions. Fuel injectors should be cleaned every 60,000 miles to maintain optimal performance. Additionally, the fuel tank and lines should be inspected for any signs of damage or corrosion. It is also recommended to avoid using lower-quality fuels and to keep the fuel tank at least a quarter full to prevent moisture accumulation.

To replace the fuel filter: 1) Locate the filter near the fuel tank. 2) Disconnect the battery to prevent any accidental ignition. 3) Use a fuel line tool to disconnect the fuel lines from the filter. 4) Remove the filter and install the new one. 5) Reconnect the fuel lines and reconnect the battery. For the fuel pump: 1) Raise the vehicle and remove the fuel tank. 2) Disconnect the electrical connector and fuel lines. 3) Remove the old pump and install the new one. 4) Reassemble in the reverse order. Always follow proper safety procedures when handling fuel components.

If the vehicle is experiencing poor fuel mileage, rough idling, or difficulty starting, check the fuel filter for clogs and replace it if necessary. If the fuel pump is faulty, you may hear whining noises or experience a lack of power. Use a scan tool to check for any trouble codes in the engine control module. Low fuel pressure can be diagnosed with a fuel pressure gauge. Consult a professional if issues persist or if you are unsure about any step in the process.

To optimize fuel efficiency, maintain proper tire pressure, remove unnecessary weight, and drive at consistent speeds. Avoid aggressive acceleration and braking. Regularly tune up the engine and ensure the air filter is clean. For performance, use high-quality fuel with the recommended octane rating. Avoid using fuel additives unless specified by the manufacturer. Keep the fuel system clean and well-maintained to ensure optimal engine performance and fuel economy.