There is a stop fuel solenoid on the fuel pump. Is this what you are asking? When you push the stop button on the panel, this activates the solenoid and cut the flow to the engine. This is how the Yanmar is stopped.
With best regards,
Sailing Yacht: Cream Puff
From: amelyachtowners@... [mailto:amelyachtowners@...]
Sent: Monday, January 04, 2016 4:11 PM
Subject: [Amel Yacht Owners] Re: Glitchy starting Yanmar 100HP
OK, so I am officially confused. I originally thought that the components in Bill's picture were for starting the Yanmar. I now know that the negative solenoid also depresses when someone else pushes the stop button in the cockpit to stop the engine; I can hear it and feel it click, so I know that is part of the process, but my engine does not stop so some other part of the stop circuit has gone awry. What turns off the diesel fuel? Is there not another STOP solenoid (and perhaps diode) connected to the fuel pump somehow?
[Non-text portions of this message have been removed]