Pump priming

Discussion in 'Motorhome Chat' started by Baycott, Feb 17, 2015.

  1. Baycott

    Baycott Funster

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    Hi all,
    I have just filled my fresh water tank ready for a trip at the weekend to check things out after the winter.
    The pump runs, some water spits out but doesn't actually run.
    Am I correct in assuming the pump needs priming after the winter drain Down?
    If that's the case how do I go about it?
    Would appreciate any advice.
    John.
     
  2. K9Brian

    K9Brian Funster

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    Usually it takes time for the hot tank to fill before any water flows out of the hot tap. Have you allowed time for this to happen?
     
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  3. Wickolad

    Wickolad Funster

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    Also worth just checking the drop valve has been closed again following the drain down. I've forgotten a few times. :)
     
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  4. Baycott

    Baycott Funster

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    Yes I have run the cold and hot taps for 3 or 4 mins and it is still starting rather than running.
     
  5. Baycott

    Baycott Funster

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    I did forget it but have now closed it ..................no change.
     
  6. Wickolad

    Wickolad Funster

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    Probably an airlock, I usually try the tap on cold nearest the pump first to get it pulled through then to hot then on both and work back to the furthest, leaving the closest running and so on. Seems to work ok that way for me. As said, sometimes it can take a couple minutes but once its through the closest tap, others clear pretty quickly.
     
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  7. K9Brian

    K9Brian Funster

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    If that doesn't work it might be air being drawn into the system. Check filter bowl in case it cracked over winter and check all joints in the pipe run.
     
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  8. davejen

    davejen Funster

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    Open ALL the taps including the shower if fitted, we normally turn each between hot and cold, eventually they flow as they should. Just takes time, so be patient!.
    Cheers, Dave(y)
     
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  9. cakey

    cakey Funster

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    I would agree with davejen but would add that as water starts to flow through a tap then close it. Also don't forget to purge the toilet, that is assuming it the same as ours.
     
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  10. The Wino

    The Wino Funster

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    I would look at the bowl on the filter if it has a very smALL CRACK IN IT IT WILL DRAW IN AIR AND NOT GIVE A GOOD FLOW IT MIGHT ALSO LEAK IN THE CUPBOARD (oops hit the caps key by mistake)
     
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  11. sedge

    sedge Funster

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    In our Bessie, there was an order to do the taps to get rid of the air. The shower and bathroom sink were the same tap (on a long hose) and that was the first tap, after that had coughed spluttered and was running, the kitchen worked immediately. If you forgot and turned the kitchen one on first, not much joy.

    In the Pilote the kitchen one is closest, so it's that one first.
     
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  12. Theonlysue

    Theonlysue Funster Life Member

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    On my instructions it says to run the furthest hot tap from the pump. Check that the dump valve near the boiler is closed, and if there are any other drain taps. The boiler holds approx 10 litres so you may have to run it for quite a while. Then the next nearest. When done, repeat with cold taps.
    If this doesn't work, empty whole system and try again.
    Hopefully something simple like an air lock. Good luck.
     
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  13. Baycott

    Baycott Funster

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    Well, I have now tried all suggestions :Eeek:
    Made sure no cracks in filter bowl, drain tap off, open furthest tap first, nearest tap first all to no avail. There are no leaks anywhere.
    Pump still runs fine but water spurts out of the tap.
    When all taps are closed the pump continues to run and the system won't pressurise although when a tap is opened after this there is obviously pressure there as water spits out fiercely.
    Any ideas guys (and gals)?
     
  14. mjltigger

    mjltigger Funster

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    Does yours have microswitches on the taps or an in line pressure switch. What you describe sounds like my caravan did when the pressure switch needed adjustment. In the caravan it was a small plastic thug I had to turn to get just the right flow.
     
  15. Baycott

    Baycott Funster

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    It is a pressurised system so I don't think there are microswitches on the taps.
    I don't know of an adjuster or where it would be.
    I am beginning to wonder if diaphragm is damaged???
     
  16. mjltigger

    mjltigger Funster

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    is the pump running smoothly or can you detect a pulse in its noise.

    On the caravan the adjuster was in the very first bit of pipe where the pump connected to the van. I wouldn't have found it without the user manual.

    Diaphragm is definitely possible but beyond my knowledge to help with unfortunately
     
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  17. Baycott

    Baycott Funster

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    Thanks for your suggestions @mjltigger
    Yes pump is running smoothly but just seems to be dragging air in from somewhere. When I run the hot tap there is all sorts of gurgling in the boiler.
     
  18. mitzimad

    mitzimad Funster

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    if you have acces to a hose pipe try back feeding itb switch off pump connect the hose to one tap and have all other tapswhen all taps are passing water turn of or diconnect the hose before shutting all but one tap and switch pump back on connection to tap doesnt need to be total just holding it there will do your just trying to fill system
     
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  19. Sundowners

    Sundowners Funster Life Member

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    Hi
    With ours--------I switch pump on with ALL taps off-----leave pump running a few minutes------crack one tap a little to let air out then close-----just repeat this until only water comes out-----then open--and close all taps until whole system is bled-----always works for us.
    Nigel & Pamala
     
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  20. The Wino

    The Wino Funster

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    If it is the same on hot and cold probably an air leak before water enters the pump or it would pump out water not suck in air
     
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