Got a 1966 250sl which is overfuelling. Runs for thirty seconds and then stops. I decided to crack open the injector pipes and to see if it was poor pump pressure or over. To my horro as soon as you turn on the ignition and the electric pump starts, petrol starts pouring from all six injector pipe. All of them are open, so I presume the plungers are either all stuck or dead. Any ideas and where can I get a technical drawing of the injector pump block/distributor ?