"After removing tape that was wrapped around the wires I a found a really ugly solder joint, where someone spliced the wire from 87-2 (Blue/Green) to 87-2 (Yellow/Black)."

This is suspect. The blue/green wire should not be spliced to the yellow/black. If it is, you're the victim of a previous owner's hack repair, most likely to circumvent replacing a defective pink label ECU, which I understand you already have done.

Also, it appears to me there's a typo in your response, repeating a reference to terminal "87-2."

"My wiring color does not match your post but I imagine that is a normal variation."

No, there is no variation expected. The wire colors need to match. The Bentley's copy of the 1990 Volvo manual is correct if poorly reproduced. The fuel relay is item 217 in grid J2 on p. 390-52 first edition. When you get your manual, it will look more like this:



And you can post any pics you have if you first upload them to a host site. By what you describe, the pictures will tell the story.


--
Art Benstein near Baltimore

When a man steals your wife, there is no better revenge than to let him keep her. -David Bissonette