I just finished filling up my 1969 (8/68) FJ40 gas tank and adding Sta-bil for seasonal storage when I noticed small amount of fuel is leaking from the top of my original Kyosan Denki fuel pump. Does anyone know a way to avoid having to drain the gas tank before I work on the fuel pump? All fuel lines are original. I am not aware of a shut-off valve between the tank and the fuel filter. Any suggestions or short-cuts are appreciated!