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with the cat design, I think you would be more likely to find fuel in the coolant or vis versa with a seal failure, then excess fuel in the oil. All diesels ultimately wind up with fuel in the oil, low engine loading and low op temps can cause more of this... The MUI and HEUI injectors both...

here is an overview of the cat 3116 fuel system and checking out the primer specifically. If you have a leak in the supply line or a leaking flapper check in the primer and a leak anywhere else, the fuel drains back to the tank as it doesn't have a foot valve on the supply line in the tank.