I have a brand new 2016 Fatboy S and have noticed that all the oil in the oil tank drains into crankcase within 2 days of being parked. On start up, it takes 5 seconds for oil pressure light to go out and the oil is pumped back into the tank. It has only done 4500km. The leak down seems to be getting worse. 
From what I read, the oil draining into the crankcase past the georotor oil pump is normal for a softail when it is parked for a few weeks or more.
I have talked to the local HD dealer and he confirms it will leak oil from the tank into the crankcase, but doing it within a day seems to be unusual? He is going to write to HD to ask if it is normal for the tank to empty in a day.
The bike is still under warrantee and even if HD says it is normal, I don't buy it. My wife's brand new 2016 Fatboy S, same kms, shows slight drop on the dipstick, even after sitting for a couple of weeks, where my oiltank would be completely empty.  
Has anyboy else experienced such a rapid leak down with their Softails? and would a new oil pump be the solution?
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Ee

The dealer did some research with HD and says the wavy spring washer that sits between the two plates with the gerotors on either side is faulty. He says the strength of this wavy spring washer controls the leak down. So my ride is booked in at the end of the month to get the faulty spring washer replaced and he will also check whether the gerotors are within tolerance and replace as necessary. Also says no dowels are needed to align the oil pump on the 2016 models.
I am pleased with this result.

A good outcome to what seems to be problem that should not occur.

WoW, I have never noticed, I may have to check my oil more often