90 300E - died while driving at 70mph

[arkie]

I just picked up a 1990 300E (M103 engine) with 188K on the clock at a local estate sale. According to the people I bought it from, the PO "worked on Mercedes for over 30 years". The car appears well-cared for for the age and miles, and it started and ran good this morning when I was eyeballing it. I bought it and came back this afternoon to get it - started up fine and drove it about 7 or 8 miles when it suddenly (and I do mean suddenly) died at 70 mph while crossing the "mighty Mississippi" river. Coasted across the bridge, fiddled with the car a few minutes, then called a wrecker and had it dropped at the shop. Did the usual test to separate fuel issues from ignition issues - sprayed with starting fluid and it starts on starting fluid and runs until starting fluid is removed. Pulled the hard line between the fuel distributor and the fuel pressure regulator and hit the key and I get a strong flow of fuel. I pull a couple of the injector lines and they are bone dry. I can have someone operate the starter and press the air flap all the way down while cranking and get no fuel at the top of the fuel distributor with the injector lines removed. I've unplugged the electrical connector to the EHA and I can still get no start. I have plenty of fuel pressure to the cold-start valve. My experience with the KE-Jet is somewhat limited. When the car was running, it was very well-behaved, easy to start and plenty of power. I can get it to start on starting fluid without a hitch, but as there is no fuel in the fuel injector lines it won't continue to run. Any helpful hints?