This sound like the most obvious explanation. My assumption has been that the unused vacuum pump has been pulling oil into the bottom of the fuel pump and that plus the engine pressure is forcing it thru the cork gasket & air from the fan is blowing the mist onto the top of the pump. I am going to replace the cork gasket with another type to see if that works. If not, then it will be the pump to block gasket & if I still have the problem, I guess I'll just have to replace the entire assembly with a new fuel pump with no vacuum booster built into it. Thanks for all the suggestions!
I had a new dual action pump on mine a few years back and it leaked oil. Tried another one and it did the same thing. A small leak from the front cover area can also blow back and be caught by the pump body.
