Buick Century 1997-2005 Fuel System Specifications

The 1997-2005 Buick Century features a fuel-injected engine with a fuel tank capacity of approximately 16 gallons. The fuel system includes components such as fuel injectors, fuel pump, fuel lines, and fuel pressure regulator. The vehicle is compatible with regular unleaded gasoline (87 octane) and is not designed for alternative fuels like E85. The fuel system operates at a pressure range of 35-45 PSI, depending on engine load and speed.

Regular maintenance of the fuel system includes replacing the fuel filter every 15,000 to 30,000 miles, inspecting fuel lines and connections for leaks or corrosion, and ensuring the fuel cap is sealed properly to maintain fuel pressure. Additionally, cleaning fuel injectors every 30,000 miles is recommended to maintain optimal performance and fuel efficiency. Always refer to the owner's manual for specific intervals and guidelines.

To replace the fuel filter, start by relieving fuel system pressure using the procedure outlined in the service manual. Locate the fuel filter, typically found along the fuel line near the gas tank. Use a filter wrench to loosen and remove the old filter. Install the new filter by hand tightening it in the same orientation as the old one. Reconnect the fuel lines, start the engine, and check for leaks. Properly dispose of the old filter and wash your hands thoroughly.

Common issues include poor engine performance, decreased fuel efficiency, or difficulty starting the engine. Potential causes include a clogged fuel filter, faulty fuel pressure regulator, or malfunctioning fuel injectors. To troubleshoot, check the fuel filter for blockages, inspect fuel lines for leaks, and use a scan tool to check for OBD-II codes related to the fuel system. If issues persist, professional diagnosis may be required to identify and repair faulty components.

To optimize fuel system performance, ensure regular maintenance such as fuel filter replacements and injector cleanings. Use high-quality gasoline from reputable stations and avoid overfilling the fuel tank. Keep the engine properly tuned, including spark plugs and oxygen sensors, to maintain optimal fuel efficiency. Avoid aggressive driving habits and maintain consistent speeds to improve mileage. Additionally, consider upgrading to high-flow fuel components if modifications are planned.