With a very big hammer
17.5 gallons, approximately
It is 18 gallons/68 liters.
67 Liters or 18 gallons.
It hold 18 gallons of fuel.
Hey Cynthia==It is inside that big black fiberglass box in the right rear of the engine compartment. GoodluckJoe
inside the front of the carb unscrew the fuel line then the big bolt on the front of the carb its inside the fitting
Pull the fuse, remove the lower dash and disconnect the BIG YELLOW wire leave the fuse out and reassemble the dash
I have a 1990 lesabre and im 90% sure its a 16 gal.