Bill,
There are two sections to a MFI pump; one handles the fuel and the other is lubricated by the engine oil. Both areas need to be purged of the original fluids and replaced with a preservative oil.
Pages 42-43 of CMA have some good instructions.
Check Measure Adjust (CMA)
http://www.scatliff.mb.ca/pelican/MFI_Check_Measure_Adjust.pdf
I think the MFI pumps were originally preserved with the Bosch Testing Oil 61 v 11. I would prefer something like Marvel Mystery Oil that has more viscosity.
Both the fuel area and the oil area need to be thoroughly rinsed with the preservative oil to insure that no gasoline or water/fuel contaminated oil remains. A slow electric drill works well for spinning the pump. Never spin the pump without oil, preservative oil, and/or gasoline in the appropriate areas.
The best situation with a running engine is to add preservative oil to the fuel prior to the engine being removed. Let it fowl the plugs.
Protecting the nozzles is as important issue as the pump.
Never leave a pump unprotected. Even just pouring the gasoline and old oil out and pouring in some fresh engine oil while turning the pump by hand is far better than nothing.
Best,
Grady