Fresh water tank query

Discussion in 'Motorhome Chat' started by Kanberlingo, Nov 16, 2009.

  1. Kanberlingo

    Kanberlingo Read Only Funster

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    Hi, A very strange thing has occured with the fresh water tank capacity in our 2007 Chausson Allegro83.

    Arrived on a site last week & filled the tank up, but after only a short while, the water started to gush out of the filler neck. On checking the control panel reading it only indicated 58 litrs?? when full it normaly shows 128 ltrs. So I reduced the flow thinking it was "backing up" but it still poured back out of the filler. The pump was on & the taps were being bled during the fill, as per normal. So I left it to see how long the water was going to last. It soon became obvious that there was only the 50 odd ltrs as we soon ran out quicker than we would normaly have expected.

    Arriving back home, I re-filled the tank on it's dead-level hard standing, thinking the site we had been on, wasn't as level as we had thought, even though the spirit level indicated that we were level (You tend to grasp at any possible solution) but the reading was 72 ltrs??? with the water again over spilling from the filler.

    I am baffled, it just doesn't make sense. Unless someone out there knows what's going on. The only thing that I have done that is different from the norm, is to have lowered the automatic drain safety switch to completely drain the system as we hadn't planned on using the MH for a few weeks. But as I've said earlier, both taps were open during the re-fill with the pump on to purge the system, & obviously the automatic drain valve back in the closed position..

    Cheers

    BeeJay
     
  2. Heyupluv

    Heyupluv Read Only Funster

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    Mine has a large filling hole (about 2") but also has a breather tube about
    1/2" .............and even with all that, if the flow is to fast, its gets a air/blockage /bubble so you have to stop then start again slowly .....but if the wife was filling and it gushed out of the filling hole, she would think the tank was full...as many people would ..... even though there might only be 20 to 50 liters in the tank....
    I have never left the taps open while filling and the flow back only happens when the water flow is to strong
    Mel

    Also under our seat (tank inside) is the 110 ltr tank with a BIG red cap check inside yours and try leaving the cap off to clear the air lock BUT DON'T for get to replace before you carry on filling as the water will be all inside the van
     
    Last edited: Nov 16, 2009
  3. Kanberlingo

    Kanberlingo Read Only Funster

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    Cheers Mel, but we've had this MH for app a year now & never had any problem with filling before. Our water supply at home is pretty strong, & when duing the usual rinse through after being stored for a while, the tap is on full blast, & usualy takes a good 10mins to fill to the max with never a "blow-back"

    Even after allowing the water to reach the top of the filler neck, where I can see it, any air in the tank should find its way out, it's inconceivable that air could be in the tank when the water level is fully up to the top of the filler tube.

    I've even tried filling very slowly, but the problem is the same.

    BeeJay
     
  4. Heyupluv

    Heyupluv Read Only Funster

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    I agree with what you are saying........the motorhome of ours was new in July 2008 and for the first 12 months we also had no problems and this has only happened in the last 4 months.........and it seems after it has overflowed, and have I stop filling for 3 to 4 seconds...then start again slowly and increase back to full flow.... that seems to clear the problem and it fills to a full tank as normal..........so in mind mine is a air lock
    Yours !!!!!!!!!!!!?????????
    Mel
     
  5. Kanberlingo

    Kanberlingo Read Only Funster

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    Having now removed all the gubbins to get to the onboard tank, it's obvious that the tank is full. So the fault is with the sender unit or the console receiver.:cry:
    My estimation of the tank not being full in relation to the time it took to fill it, was obviously off target. I'm hoping that by removing the sender unit, I can maybe see what the problem is, but being electonic it'll more than likely mean costing an arm & a leg for a new one.

    Cheers

    BeeJay
     
  6. vwalan

    vwalan Funster

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    is the pickup for the water going through the top of tank? as it been pulled out abit? forget the gauge for a while .is the tank full?i have known this to be the problem of appearing to run out of water very quickly. the gauge could be linked to this or be a different problem.
     
  7. pappajohn

    pappajohn Funster Life Member

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    to be honest i wouldnt bother renewing it...i have yet to see one thats accurate and with 128ltrs of water you should last quite a while so top up as and when you can.

    you wouldnt usually want to up sticks and move to a tap on site anyway so a water carrier/watering can would be an asset.
     
  8. vwalan

    vwalan Funster

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    do you actually run out of water or is the tank sender what made you think it was empty. to me empty is no water coming out the taps.
     
  9. Kanberlingo

    Kanberlingo Read Only Funster

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    I like to attempt to fix things, (see my Avatar) but I reckon you're right, it aint worth the hastle or expense. besides, even with the console showing an incorrect reading, we still get the audible signal when there's app 10ltrs left, which is working as I checked it when I was draining off. But now having got to the root of the problem, I'm not too concerned, but it had me scratching my pate at first.

    Cheers all.

    BeeJay
     
  10. pappajohn

    pappajohn Funster Life Member

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    i know what you mean......if it aint broken it doesnt need fixing so break it anyway...:Rofl1:

    mines the old super accurate (not) 4 or 5 prong resistance sensor and empty shows 1/4...full shows 3/4....anything in between is a bonus.

    when the tap runs dry it time to fill. :thumb:
     
  11. hilldweller

    hilldweller Funster Life Member

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    What kind of sender is it. The only type I've seen is the multiple probe one.

    They don't seem to like fitting quality units, like ultrasonic, too expensive I guess and the accuracy is not really needed.
     
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