Welcome Back › Forums › Propulsion › Engine › Secondary Fuel Tank
- This topic has 8 replies, 6 voices, and was last updated 6 years, 4 months ago by Jean Clair.
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February 16, 2018 at 18:11 #26251Czarina BlueParticipant
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 #26252João de Almeida FarrachoParticipantHi 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 #26255Czarina BlueParticipantThanks that makes sense Joao. Duncan
March 12, 2018 at 22:42 #26258Erik TheunissenParticipantThanx for the tip. wasn’t even aware we had a secondary fuel tank. Still lots to discover 🙂
March 29, 2018 at 12:11 #26273VoltairParticipantThe 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 #26279ModeratorKeymasterNot 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 #26281Erik TheunissenParticipantHi 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 #26285Czarina BlueParticipantIn 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 #26343Jean ClairParticipantHi 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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