Had the same trouble with my 1211 a while back, and it was because there was fuel in the oil causing some blow by. It was forcing the oil through the breather -into the tube, and then into the filter housing. I rebuilt the carb, reset the float, and took the breather assembly apart and thoroughly cleaned it...and no more oil blowing through the breather/hose into the filter. I cant remember if I swapped out the fuel pump or not...
good luck
Jeff (teet)
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CCC 1211
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1962 Original
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