Auxillary water tank DIY

Discussion in 'Tech/Mech General' started by Ridgeway, Aug 13, 2016.

  1. Ridgeway

    Ridgeway Funster

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    The fresh water tank on our Laika is small for the number of people that use the van. We travel with 2 adults, 4 children and 2.5 dogs so we do need a reasonable capacity and we only have a 2/3 day autonomy range based on the vans standard 80ltr tank which we would like to extend. There was a factory option for this and the aux tank does come up on the display. I was thinking of a complete DIY rather than going down the expensive manufacturers parts, cant imagine how much theyd be, but just very expensive.

    So I can source a suitable tank, Ive worked out how to secure into the space alloted for this extra tank but whats the usual method of filling an aux tank and do you normally feed the main from the aux
     
  2. Ridgeway

    Ridgeway Funster

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    and before anyone mentions payload, i accept that I would be 100kgs more than I am today
     
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  3. Speve

    Speve Funster

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    I would think you could link the two together so that the same pump serves both and the fill point would fill both.
     
  4. Ridgeway

    Ridgeway Funster

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    so basically gravity fed, need to check if theres enough height for that, suspect not.
     
  5. tonyidle

    tonyidle Funster

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    If the base of each tank is at the same level a pipe linking the bottom of one tank to the other is all you need - no pump or fill connection to tank 2. If the tops of the tanks aren't at the same level the breather from the lower tank must rise as high as the top of the highest tank.
     
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  6. Ridgeway

    Ridgeway Funster

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    that sounds simple enough to achieve, may have to jack up the aux tank and play about with the heights a bit but this solution should do it, thanks
     
  7. Bart

    Bart Funster

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    Currently thinking on doing the same in our bessacarr over the winter as 90ltrs goes wa(y)y to fast. That fast I near swear it's leaking ... But the only time I ever see water below it is when refilling the tank.
     
  8. pappajohn

    pappajohn Funster Life Member

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    Sorry but Incorrect.....
    The water entering the second tank needs to displace the air already in the second tank so a link both top and bottom required.
    Bottom to allow water in, top to allow air out....and visa versa when emptying
     
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  9. tonyidle

    tonyidle Funster

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    Yep - I said that.:p
     
  10. Bart

    Bart Funster

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    @Ridgeway did you ever add another fresh water tank ??
     
  11. Jim

    Jim Ringleader

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    I had a motorhome with two tanks, one was slightly lower than the other. Connected in two places by a fat 1.5 inch hose. it was a year or two before I realised we had two tanks, in fact we only found out when one of those fat hoses came off while while driving too fast and bouncing around the racetrack at Stratford. :LOL:
     
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  12. Ridgeway

    Ridgeway Funster

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    Job scheduled for this Spring, so no not yet.

    Haven't decided whether to buy or build the tank yet, if bought it will be standard baffle tank but awkward to fit and a compromise on size, if built i can avoid those points but the job gets bigger...
     
  13. tonyidle

    tonyidle Funster

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    I assume you know of CAK tanks when sourcing what you need - worth a look.
     
  14. Colinyellowspanner

    Colinyellowspanner Funster

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    A bit late to this thread but anyway: removed 88 litr inside locker tank, sold on eBay. Replaced with underfloor 120 litr underfloor tank, made to order by CAK Tanks. Excellent service from them, send them a drawing size, location for inlet outlets etc. Job total success
     
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  15. Ridgeway

    Ridgeway Funster

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    Yes seen CAK tanks but it would be over €100 for delivery plus import duties etc. Going to see what I can find locally at a reasonable price. The official Laika unit is €350 ish...
     
  16. Bart

    Bart Funster

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    how much did the 120ltr custom made tank cost you if you don't mind me asking
     
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