Reply
 
Thread Tools Search this Thread Display Modes
 
Old 07-13-2017, 10:54 AM   #1
Newbie
 
City: Oceanside
Join Date: Jun 2017
Posts: 4
Any info

Click image for larger version

Name:	IMG_0245.JPG
Views:	66
Size:	25.1 KB
ID:	66695

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.
craigthill is offline   Reply With Quote
Old 07-13-2017, 11:12 AM   #2
Moderator Emeritus
 
ksanders's Avatar
 
City: SEWARD ALASKA
Vessel Name: DOS PECES
Vessel Model: BAYLINER 4788
Join Date: Feb 2011
Posts: 6,267
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.
__________________
Kevin Sanders
Bayliner 4788 Dos Peces
Seward, Alaska - La Paz, Baja California Sur
https://maps.findmespot.com/s/XLJZ#history/assets
ksanders is offline   Reply With Quote
Old 07-13-2017, 11:31 AM   #3
Guru
 
Ka_sea_ta's Avatar
 
City: Puget Sound
Join Date: Jun 2016
Posts: 631
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?
Ka_sea_ta is offline   Reply With Quote
Old 07-13-2017, 11:35 AM   #4
Newbie
 
City: Oceanside
Join Date: Jun 2017
Posts: 4
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.
craigthill is offline   Reply With Quote
Old 07-13-2017, 11:39 AM   #5
Newbie
 
City: Oceanside
Join Date: Jun 2017
Posts: 4
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.
craigthill is offline   Reply With Quote
Old 07-13-2017, 12:52 PM   #6
Guru
 
dhays's Avatar
 
City: Gig Harbor
Vessel Name: Kinship
Vessel Model: North Pacific 43
Join Date: May 2015
Posts: 9,046
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.
__________________
Regards,

Dave
SPOT page
dhays is offline   Reply With Quote
Old 07-13-2017, 01:01 PM   #7
Guru
 
Ka_sea_ta's Avatar
 
City: Puget Sound
Join Date: Jun 2016
Posts: 631
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.
Ka_sea_ta is offline   Reply With Quote
Old 07-13-2017, 01:07 PM   #8
Guru
 
City: Melbourne, FL
Join Date: Dec 2014
Posts: 1,731
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.
stubones99 is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Trawler Port Captains
Port Captains are TF volunteers who can serve as local guides or assist with local arrangements and information. Search below to locate Port Captains near your destination. To learn more about this program read here: TF Port Captain Program





All times are GMT -5. The time now is 12:11 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012