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Out of curiosity, how is your fuel tank, any rust? One cause of fuel in the crankcase oil is a leaking FDC piston rod. The metal to metal seal can be marred by tiny rust particles and fuel will leak directly into the IP and mix with the oil. So, bypass the FDC, change oil and go from there.

The black rectangle shows the shaft where a leak would occur if at all. The shaft/bore is the only connection between the fuel and the IP governor housing.

Robert, if you suspect the FDC, just replace it. It is an easy job, I have had mine off for modifications. If the FDC leaks, it would effect its calibration. I'd like to know the real reason for bypassing them, if they are bypassed there will be a slight increase in fuel delivery for any fuel...