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Old 07-13-2017, 10:54 AM   #1
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This is the fuel s system on my Nordic Tug. As you can see it was made by Harman Marine that is now defunct. I am hoping that someone has the same and can provide operational, and tech info... drawings, schematics, anything.
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Old 07-13-2017, 11:12 AM   #2
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It just looks like solenoid valves n place of the common ball valves you see.

Center switch position valves vlosed.
Starboard position, starboard valve is open, port closed
Port position, port open, starboard closed

What I do not like about it is that your boat's locomotion is 100% dependant on a continously energized solenoid. Not that it isn't happening on your engine anyway, just something to keep in mind and have a spare for.
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Old 07-13-2017, 11:31 AM   #3
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That system looks like a list to one side waiting to happen. Why would a manufacturer use a dynamic system like fuel to balance a boat?
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Old 07-13-2017, 11:35 AM   #4
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Well, I agree about the solenoid valves. While the operation seems quite straight forward, there are Murphy Fuel switches on each tank. I can't figure why they are in the circuit. You would think that they shut down a transfer pump on a full tank, but there is no transfer pump. The system uses the engine to transfer the fuel back and forth. Hence my desire for schematics or anything else.
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Old 07-13-2017, 11:39 AM   #5
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As to the list question, you could use it in that way, but I believe it is a fuel polishing system using the engine to move the fuel from tank to the other through the filters.
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Old 07-13-2017, 12:52 PM   #6
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I would like the convenience of that system however, I would be concerned about failure. If the powered off condition allowed both valves for both feed and draw to default to the open position, then I would be less concerned. In effect, the powered solenoid does nothing but close off the opposite line from the indicator light.
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Old 07-13-2017, 01:01 PM   #7
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Quote:
Originally Posted by craigthill View Post
As to the list question, you could use it in that way, but I believe it is a fuel polishing system using the engine to move the fuel from tank to the other through the filters.

Fuel polishing makes a lot more sense.
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Old 07-13-2017, 01:07 PM   #8
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Depending on the engine, there can be a significant amount of fuel returned from an engine, which is what might cause a list talked about by Ka_Sea_ta.

If you have that type of engine that has heavy flow on the return line then you're using the filters as a pseudo polishing system, since every gallon goes through the filters to get to the engine, and the return fuel will go back to one of the tanks.
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