Where is the fuel filter located on a 1981 Buick Regal 3.8?

On a 1981 Buick Regal with the 3.8L engine, the fuel filter is located on the frame rail, near the fuel tank. It's usually toward the rear of the vehicle, on the passenger side. However, the exact position can vary slightly depending on specific options and body style. You'll likely need to get under the car to locate it. Look for a cylindrical canister with fuel lines attached.