As you did not list what model Buick you are referring to it is impossible to answer your question. All I can tell you is to follow the fuel line from the fuel tank to the engine and you will find the fuel filter.
The fuel filter is located near the rear of the vehicle, forward of the fuel tank.
fuel filter location in 1990 buck lesabre
The fuel filter is on the drivers side fuel line by the gas tank under the car.
How do you replace the fuel filter on a 2003 Buick Regal?
I believe that one is under the car near the gas tank.
Where is the Fuel Filter on a 1990 Cadillac Seville
fuel filter location
What happens when a 1989 buick reatta fuel filter goes bad?
How do you replace fuel filter on 1993 Buick LeSabre, the replacement filter I bought appears to be a snap on. I have only replaced the screw on type.
Where is the fuel filter located on a 1990 chevrolet blazer?
No it does not.
Probably under vehicle follow the fuel line from the tank Probably under vehicle follow the fuel line from the tank