I think it is about 18 and a half gallons, I have a 2001.
The 2001 Buick LeSabre's fuel tank holds 18.5 gallons as found on http://consumerguideauto.howstuffworks.com/2001-buick-lesabre-3.htm
Approximately 25...
4 quarts
18 US gallons!
A 2005 Buick LeSabre automatic transmission requires 7.4 quarts of Dexron III fluid.
20 gallons
4.5 leaders
There are 2 bolts that hold it to the rear of the engine.
3.8 or 3800? 4.5 quarts with filter. About eight cases in the trunk.
no sensor,but if cap dont seal it will set code 440,fuel tank not hold vacuum.make sure the gas cap is tight,if is replace with new.
Standard fuel capacity of the Eighth Generation (1995-1999) was 20 gallons.
8inch weiner. preferably in one of your holes.