Secondary Fuel Tank

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This topic contains 8 replies, has 6 voices, and was last updated by Jean Clair Jean Clair 3 weeks, 2 days ago.

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February 16, 2018 at 18:11 #26251
Czarina Blue
Czarina Blue
Participant

I have just cleaned out my port side secondary fuel tank in order to use it to increase my range, with an extra 114 litres of diesel.

I wonder if one can just open its wheel valve when you want to use it, and leave it open, letting it fill the main tank by gravity (it is positioned higher), or whether one should open the wheel valve for a period until the main tank is full-ish, then close it again, ie use it in stages in order not to overfill the main tank?

Does anyone have any experience of using it?

 

Thanks

Duncan

February 17, 2018 at 00:29 #26252

João de Almeida Farracho
Participant

Hi Duncan,

I have watched this carefully on Conche.

My opinion is that is to  close the wheel valve and  fill the wing tank on the filler plug on top of this wing tank.

And independently to fill the main keel tank on the filler plug located on the port side deck.

This way you are not creating an additional  column pressure on any piping joints in between the two diesel tanks.

Check if your wheel valve is functioning properly. On Conche I will need to replace it.

This you are able check just listening to. With the wing tank filled and with the valve closed you then may open the plug of the visit box of the keel tank and listen if you hear any diesel dripping on to the keel tank.

Hope this can help.

Greetings from Lisboa Portugal,

João

 

March 6, 2018 at 21:16 #26255
Czarina Blue
Czarina Blue
Participant

Thanks that makes sense Joao. Duncan

March 12, 2018 at 22:42 #26258
Margriet & Erik Theunissen
Margriet & Erik Theunissen
Participant

Thanx for the tip. wasn’t even aware we had a secondary fuel tank. Still lots to discover 🙂

 

March 29, 2018 at 12:11 #26273
Voltair
Voltair
Participant

The breather on the main tank will put diesel into the bilge if you fill it fuller than 38 imp galls. I don’t think this breather is higher than the top of the wing tank, so if you just leave the wing tank valve open, I think you will fill the bilge!  For sure, once you remove the dipstick plug in the main tank, you will get an eye-full!

March 29, 2018 at 21:54 #26279
Moderator
Moderator
Keymaster

Not all Nic 38’s were fitted with a secondary fuel tank – it was an option to have it added under the lazarette seat(s).

For example, our Rainshadow (hull #126) does not have these wing tanks, which leaves us very deep storage instead.

Marilyn the Moderator

April 6, 2018 at 18:44 #26281
Margriet & Erik Theunissen
Margriet & Erik Theunissen
Participant

Hi Marilyn

Thanks for explaining, have been searching and searching everywhere for those tanks.Thought i was going crazy but happy to hear we just don’t have them 🙂

Erik

April 11, 2018 at 19:40 #26285
Czarina Blue
Czarina Blue
Participant

In regard to Voltair’s post above about getting it in the eye, and breather heights, that sounds feasible. But what about the breather on the port side deck on the outside coaming adjacent to the main tank filler plug, if you overfill the main tank it bubbles and flows out of there onto the deck before it overflows from the filler neck itself.  Is that not therefore the main tank’s breather ( which is then higher than the wing tank)? Anyway, it sounds like important to use any wing tank with great care.

June 28, 2018 at 11:08 #26343
Jean Clair
Jean Clair
Participant

Hi Duncan

We have a reserve fuel tank on Jean Clair and have used it for the

eight years we have owned her.  The two tanks are connected, not only by the 1 inch feed pipe with the wheel valve but also by a 15mm breather pipe which obviously exits from the top of both tanks.  This 15mm pipe goes from the main tank to a position just under deck level before descending into the reserve tank. We always ensure there is enough space in the main tank so that we can empty the reserve into it without worrying about overfilling.  We always close the wheel valve after transfer to ensure we do not fill the main tank through the reserve. Hope that helps

Regards

Alan

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