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Old 11-24-2012, 06:16 AM   #21
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There are bronze marine fuel valves that switch both the supply and return at the same time.

A far better easy to use solution than a fuel manifold with gaggle ball valves.

Zero understanding is required when switching from Tank 1 to Tank 2 ,
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Old 11-24-2012, 11:27 AM   #22
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Of course it doesn't matter how much fuel an engine returns--- if you send the fuel return to the same tank the engine is pulling from it will never overfill unless you have an engine that actually makes fuel, in which case you will have solved the world's energy problems and will become a bazillionaire and can afford a boat with any range you want.
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Old 11-24-2012, 01:05 PM   #23
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Quote:
Originally Posted by FF View Post
There are bronze marine fuel valves that switch both the supply and return at the same time.

A far better easy to use solution than a fuel manifold with gaggle ball valves.

Zero understanding is required when switching from Tank 1 to Tank 2 ,
The Coot has four fuel tanks and two fuel manifolds. One manifold selects the source of fuel for the engine and the other manifold selects which tank fuel is returned from the engine. I look forward to the puzzle of selecting the correct combination of valves.
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Old 11-25-2012, 07:45 AM   #24
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I look forward to the puzzle of selecting the correct combination of valves.

Always the most fun when a bit of mal de mere strikes , and the engine stops while climbing 5- 15 ft waves every 6 seconds.

Talk about FUN TIME!
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Old 11-26-2012, 10:40 AM   #25
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100% leaves day tank through pump and filter
20% consumed by engine
80% returned to day tank

Yes, more returned to tank than consumed by engine, but not more than originally left the tank.

Sorry I mis read the statement.
I wasn't sure how the day tank was filled to start with. I was thinking the return was off the main.
Op says off the manifold. If he wasn't sure how much fuel was in the tank to start with or the manifold was open to the day tank. Then the return could over fill the day tank.

If there was an overfill line that would dump fuel back into the main tank
coming off the day tank.

Thinking about it. How will the OP know how much fuel is in the day tank?
He didn't indicate this. Is there a Gage.

Sd

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Old 11-26-2012, 11:17 AM   #26
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FF says "a gaggle of ball valves" ---------

My "gaggle of ball valves" (15 or so) is nicely laid out, well labeled and stacked on a nice SS header. DeFever has done this decently for many years. The setup involves:
  • 4 tanks,
  • 3 engines,
  • ability to return engines' o'flow to any tank,
  • a line to pump diesel to a temporary deck tank if one needed
  • and fuel transfer between any of the tanks via a dedicated pump.
Nordhavns and other high end yachts have a "gaggle of ball valves" - in my contacts with Nordhavn blue water cruisers I've not heard that their "gaggle of Ball valves" has created issues. I'd love to post a picture, but we don't live close to the boat.
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Old 11-26-2012, 12:19 PM   #27
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Ball valves don't travel in gaggles. A lot of ball valves in a group is called a herd. :-)
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Old 11-26-2012, 12:42 PM   #28
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w how much fuel is in the day tank?
He didn't indicate this. Is there a Gage.

SD
In our case the four saddle tanks that feed the 60 gallon day tank via gravity from their lowest point through manual valves have sight gauges. The day tank, which is in the bilge umder the floor plates between the engines, also feeds from its lowest point but it has an electric level sensor connected to a fuel gauge on the instrument panel.
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Old 11-26-2012, 12:54 PM   #29
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Ball valves don't travel in gaggles. A lot of ball valves in a group is called a herd. :-)
Sure I've herd of ball valves.

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Old 11-26-2012, 06:04 PM   #30
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Ball valves don't travel in gaggles.

A low buck trick , loved by the Maineiac lobster folks is a short coupling between ball valves.

Ganged valves can make multiple selections with no thinklng , just like the real marine fuel valves, at a lower price.
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Old 11-26-2012, 07:00 PM   #31
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There are gaggles of manufacturers of ball valves designed for fuel duty, Velvac and Parker Hannifin come to mind. In addition to the 15 or so on the fuel manifold, there are another 16 or so used for water and fuel tank shutoff and sight glass valves. None of my gaggle have shown any sign of duress.
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