How to remove and install the IP is somewhere below:
DIY Repair Links
http://www.peachparts.com/shopforum/forumdisplay.php?f=82
http://www.peachparts.com/Wikka/DoItYourSelf
On the Fuel Injection Pumps of the years the original poster mentions the Oil goes from the Engine through a plastic tube and in through the side of the Fuel Injection pump. The Oil goes out through 2 holes in front of the Fuel Injection Pump.
The Drain holes are higher than the Camshaft of the Fuel injection Pump so there is always a pool of Oil inside of the Fuel Injection Pump that never drains out.
This means that if you completely loss your Oil Pressure your Fuel Injection Pump would still have Oil inside to lube it.
Meaning that your Engine will be ruined but not your Fuel Injection Pump.
When the present owner of the car said he was told it needed a new Fuel Pump that could mean the Fuel Supply/Lift Pump on the side of the Fuel Injection Pump or the Fuel Injection Pump itself.
Or simply that someone did a bad trouble shooting job and the Fuel Tank Screen is clogged or it needs Filters.
It could be that the Fuel is contaminated and quickly Plugs up new Filters so the mechanic is thinking it is the Fuel Pump because he just changed the Filters.
Or maybe they do not know how to bleed the Air From the System. Loosen the Fuel Injection Line Nuts at the Injectors; Crank the Engine and see if Fuel comes out from under the Loose Fuel Injection Line Nuts.