Back in my college days I had a 108 '70 280 SE (still one of my favorite models) that had similar problem. It would start, but dies and wouldn't start again unless you let it cool down for a few minutes. If I remember right, a mechanic changed the fuel pump for me and the problem was solved.

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Riadh
'89 560SL Rauchsilber
And what is good, Phaedrus, and what is not good -- Need we ask anyone to tell us these things?