Take pride in your Buick with new GS400 Fuel System. A Fuel System will deteriorate over time. Bring the Buick back to life with new GS400 Fuel System. So make your vehicle run more efficiently with a Fuel System. Keep your classic looking new with GS400 Fuel System. These Fuel Systems will help your engine to both conserve more fuel when you want to and deliver a larger fuel load when you need it. A new Fuel System is a great investment for your vehicle.