Bob
I do not know about the fuel leak in the C-46. I took only two flights in a C-46-one the worst (into Korea) and the other the best (out of Korea) .
I under stand that the C-46 did not fair well in the post WWII era as a commercial transport- due to high operating costs. The C-47 was OK and then the airlines started moving to the DC-4 and DC-6. Those two- R2800 engines burned about 200 gallons per hour, so a leak would have to be big to our run the engines.
FWIW