Well, it's Tuesday, and no trouble starting my car since I replaced the "Fuel Pump Check Valve", so this must have been a "Vapor Lock" type situation first thing in the morning, where the fuel was not up to full pressure.
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If it needs to be maintained, repaired or replaced on a 1990 240, I've probably done it. '90 240DL, 291K looking forward to 300K badge (or sticker??). >>You haven't really worked on a car until you draw blood<< :-}