Water inlet leaks under pressure

pilot104
pilot104 Forum Participant Posts: 2
edited May 2020 in Caravans #1

With the water pump in the outside container and the switch onthe panel turned on water just gets blown back and not pumped into van.

 

Comments

  • chasstreet
    chasstreet Forum Participant Posts: 57
    edited May 2020 #2

    My guess would be the non return valve 

    depending on age of van, you may find below useful 

    if you look at the pipe work inside the van, and trace the pipes you will find a black non return valve, it’s approx 75 mm long. 
    easy to replace as most caravans are just push fit. 


    or it could be the pressure switch, you could check the switch by reducing the pressure setting on the back of the switch, and seeing if it helps. 

  • lornalou1
    lornalou1 Forum Participant Posts: 2,169
    1000 Comments
    edited May 2020 #3

    It could be something as simple as the O-rings on the trigger that push fits on the inlet. 

  • Simon100
    Simon100 Club Member Posts: 666 ✭
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    edited May 2020 #4

    Does the inlet have a carbon filter? That might be restricting the passage of water. Just remove it as it is not necessary.

  • KjellNN
    KjellNN Club Member Posts: 8,670 ✭✭✭
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    edited May 2020 #5

    I think we need more information....

    Model and year of van

    make of pump and inlet

    a picture of the problem could be helpful

  • stephen p
    stephen p Forum Participant Posts: 194
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    edited May 2020 #6

    Without more details I am betting on a whale Pump, I would go for new O rings (2) in the adaptor.

    Even if the inside plumbing was completely blocked there should not be leak back past the O rings.

  • lornalou1
    lornalou1 Forum Participant Posts: 2,169
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    edited May 2020 #7

    "Erm" 

  • stephen p
    stephen p Forum Participant Posts: 194
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    edited May 2020 #8

    That is not a very useful comment.

    If you have something to say about my post then please have the decency to let me know what that is.

  • lornalou1
    lornalou1 Forum Participant Posts: 2,169
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    edited May 2020 #9

    just repeating what I said in an earlier post wink not meant to be nasty.

  • Navigateur
    Navigateur Club Member Posts: 3,880 ✭✭✭✭✭
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    edited May 2020 #10

    Is this a new problem on a caravan you have used successfully before, or is it a "new to you" one? 

    I do not understand the "blown back" bit.  Where is it blowing back to?  If the pump is blowing back into the container then the polatity of the electrical connection is reversed.

  • Navigateur
    Navigateur Club Member Posts: 3,880 ✭✭✭✭✭
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    edited May 2020 #11

     A further thought on this over a glass of lunch.

    This system is designed with a micro-switch at each tap that supplies power to the pump directly or through a relay. If one or more of these switches are out of allignment then the pump will run but there will be no outlet for the water in the pipes now under pressure. It will find the weakest point, which could well be the 'O' rings on the water inlet.

    A bit of guddling under the sinks to detatch (carfully) one wire from one tap at a time will show which one is making the pump run when not needed.  If not, then it is possible there is a relay, which has jammed in on position. 

    These wee 'O' rinks should get lubricated occasionally. I just use a smear of petroleum jelly.

  • stephen p
    stephen p Forum Participant Posts: 194
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    edited May 2020 #12

    Just to clarify then!

    Without more details I am assuming a Whale system because the OP referred to an external pump. If not then my comments are not applicable.

    The O rings on the Whale system are not in the Trigger! they are in the adaptor plate on the caravan side.

    There are 2 O rings and this is not immediately obvious unless you are eye level with the nozzle in the adaptor plate.

    These O rings are fully capable of holding all the pressure that the external pump can muster, if there is a leak at the inlet adaptor (water running down the outside of the caravan) then fix the O rings first.

  • lornalou1
    lornalou1 Forum Participant Posts: 2,169
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    edited May 2020 #13

    It could be the Truma ultraflow where the o rings are fitted to the trigger assy but the OP doesn't seem to want to give to much info on what he has so leaves everyone guessing what the problem really is. 

  • TonyBurton
    TonyBurton Forum Participant Posts: 269
    edited May 2020 #14

    I don't think all modern caravans use micro switches. I think my system works on a pressure sensing switch. It switches the pump on when it detects lower pressure caused by a tap being open. The pressure switch can be adjusted by turning the small knurled knob on top of it. If it is out of adjustment the pump will run continually. I've had to change the "o" rings a number of times to prevent leaks. You can get a small bag of "O" rings from a dealer.

     

  • Navigateur
    Navigateur Club Member Posts: 3,880 ✭✭✭✭✭
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    edited May 2020 #15

    That is the system on both of my last two vans, Tony, which is why I didn't think of the older system right away.  With no further information from the OP we are all guessing what (s)he has got, but the thread has now got a lot of useful information for anyone reading it in the future.

    I find it weird that all throuout engineering there is the same oddity in supply.  You need two 'O' rings and they come in packets of five! Need twelve cylinder head bolts - Ah, that's a packet of ten!

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