it looks to me that the relay was replaced before and instead of fixing or replacing the relay they just sorted wires 30 and 87 (do not renember the numbers, chech for that) so the pumps will just start working when you turn the key on. This is evident by the missing electronics (resistors, inductors etc). Again, I want to say my experience comes from fixing my fule pump relay from an 88 300E. Maybe somebody more experienced can help here.