jcjeant
Most diesel engines I know of, shut the engines down by killing the fuel, whether they be mechanical governer or electronic (Injectors). Which is why they have a bad habit of running away when a alternate source of fuel is introduced into the balanced system.
Most notable (notorious I should say) was the Jimmy (AKA GM, Detriot Diesel 2 strokes) That is why they had a blower flap. In the old caterpillar days they used to recommend a large steel plate or even the Manuel be slammed over the intake.
As for the real big marine stuff, I can't say as I have no experiance with them