About three years ago I had the original (1988) fuel pump replaced because it had developed an leak. A month ago the aftermarket replacement developed a gas leak so I replaced it with another aftermarket unit. I used Permatex (the black liquid) on the gaskets when I changed it on Saturday afternoon and didn't drive until I went to work on Monday. I checked the oil or Thursday and it was still OK, but there was oil all over the side of the timing cover and block under the fuel pump. I felt under the flange and came away with oil on my fingers. The following I got a pair of Fel-Pro gaskets and some Permatex Blue RTV gasket maker (it uses two gaskets as the fuel pump requires the use of a plastic spacer in this application). I cleaned the flanges and sprayed them plus the spacer with carb cleaner to remove any trace of oil. I then applied the RTV per instructions and reinstalled the pump. Again, this was on Saturday afternoon and I didn't drive it until Monday.
Bottom line, it still drools oil down the side of the engine. It's still coming from the flange area.
Yes, the plastic spacer and gaskets are installed correctly... :>))
It isn't a disaster, but it's going to have to come off again. I assume it has something to do with four gasket surfaces to contend with.
I'm wondering if getting an OEM pump that (hopefully) doesn't require the spacer is my only solution, although when the garage replaced it three years ago, everything was bone dry, until yours truly got into the act...
-- Tom - Vista, CA