Take it out and put a new one in.
At the lower rear end of the engine
3.8liter, 3800 series 1
Under car by where engine and transmission meet on side closer to front of vehicle.
either side of engine block you will see the brass circular shaped freeze plug.
The power of the engine and the maximum speed of the 1961 Buick le Sabre wagon automatic are 250 hp and 100 mph respectively.
Front of engine left to right 1-3-5 Back of engine left to right 2-4-6 Click the link for a diagram.
After alot of time and searching it has come up with a 1993 buick la sabre has a total of four freeze plugs on it and are very easy to get to and change.
Yes
No, you do not have to remove the engine.
http://wiki.answers.com/Q/How_do_you_replace_the_water_pump_on_a_1996_Buick_le_Sabre"
8th digit of VIN is engine code.
The fuel pump is inside the fuel tank.