I believe that both pumps need to run for it to start, so you might check. that as well as spark.

Beyond that, it sounds like it has some sort of fuel problem. If the pumps both run, you might try pushing down on the air sensor plate while someone cranks the starter to see if you can force enough fuel to the injectors to get it started.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe