An update. I removed my air cleaner and noticed that the EHA was leaking fuel from it's weep holes. A search through this forum indicates that it's replacement time. I've already ordered a new EHA.
Also, I poured a couple of ounces of fuel in the intake and the car started up like a charm. It ran for several minutes (> 5) before I turned it off again.
Question, could a faulty EHA prevent the car from starting? Would unplugging the EHA do anything?
1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino