Well, I guess I spoke too soon! With the plug in, the oil stared coming out of a rectangular hole up on the side between the fuel pump & the vacuum pump. It was quite black even though I had just done an oil change. This was even more oil than before. I took the plug back out & now there is only a small amount of oil. I think it is time to scrap the combination fuel/vacuum pump and go get just a new fuel pump. Hopefully this will solve the issue.
For everyone's information, I removed the fuel pump since I couldn't figure out where the oil was coming from and to my surprise there was an open port between the fuel pump & the block. Turns out the previous owner (?) installed an aftermarket fuel pump with the vacuum booster on the bottom then put in electric wipers (go figure). In the process he either forgot to or missed this port altogether (as did I) until I removed the pump. Figured it would be an easy fix by installing a plug. Well, it turns out that the opening is a Metric (M10x1.0) and no one had a plug or an allen screw. Back to good old yankee ingenuity, I bought an M10 x 1.0 hex head bolt, cut it off to the length of the existing plug and used a hand file to square off the cut end so that the same wrench would fit both plugs. Then a little anti-sieze compound, a few turns of the wrench & voila', no more oil on top of the fuel pump. I'm just curious to try to figure out how long this has been like this & running! I'll go thru my receipts to see if I can find out when the fuel pump was purchased, but my guess is that it has been around a decade, since the previous owner told me it has been sitting in his garage for over 7 years with occasional startups and yard drives just to keep things lubes, etc. Thanks to everyone for all the suggestions and tips as to what was causing this issue. No onto the next project!
