1985 280SL dying

[Henryk]

HELP! Just changed dist cap/rotor/wires/plugs/air fltr, and car dies after running, sometimes within seconds, sometimes takes longer. Can not restart for a short time, after a while it starts again, just to die after a while. I can hear a little buzzing noise after it happens near the injection pump - a yellow switch with hoses attached to both sides of the pump. Can not find a manual for this "gray" car. Your help would be super duper appreciated!