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Thread: Water pump cycling

  1. #1
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    Water pump cycling

    The van has the usual flick tap and I use the panel power switch to turn the pump on,, usually only just long enough to fill whatever needs filling,, paranoia about pumping both tanks out if I split a hose somewhere I guess--
    I changed the accumulator down in Tassie, so it really not that old, pump?? who knows.. but it runs/works without any issues.
    At the moment when I flick the tap there is no residual line pressure..
    I'm pretty sure this is why we changed the Accum in Tassie,, what other faults will cause the pump to cycle?
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  2. #2
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    Water pump cycling

    Only thing I can think of is that the line is losing pressure somewhere, in other words a leak. It only needs to be an occasional drip for the line pressure to drop. Could even be the washer in the tap itself
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  3. #3
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    Could also be some foreign matter holding the one way valves in the pump from sealing

  4. #4
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    I had to replace the Jabsco pressure pump in my Jayco Expanda because the old one Karked it, I haven't got an
    accumulator fitted to the van and the water just comes on when I turn the tap on,
    The pump provides plenty of pressure for showers etc., Do I really need to fit an
    accumulator?

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  5. #5
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    When we leave the switch on our pump cycles on for a millisecond every now and than....

    I just assume the pump leaks back a bit as I cannot find and leaks in the pipework

  6. #6
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    Quote Originally Posted by weeds View Post
    When we leave the switch on our pump cycles on for a millisecond every now and than....

    I just assume the pump leaks back a bit as I cannot find and leaks in the pipework
    I am pretty sure that there is a return valve built into the pump and that could be slowly dying and is causing the "Cycling", If you haven't got any leaks then its no big deal really just turn the pump off when not using it.
    I always turn the pump of at the switch when not using it, Just in case.
    You only get one shot at life, Aim well

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  7. #7
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    Quote Originally Posted by trout1105 View Post
    I had to replace the Jabsco pressure pump in my Jayco Expanda because the old one Karked it, I haven't got an
    accumulator fitted to the van and the water just comes on when I turn the tap on,
    The pump provides plenty of pressure for showers etc., Do I really need to fit an
    accumulator?

    I pretty sure the accumulator is more to stop the micro switching weeds is on about,, this was probably a concern when this van was built,, but maybe new pumps dont have that worry??
    Hmm.
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  8. #8
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    Mine, no accumulator, does the same thing, no leaks. I am assuming a leaky non return valve on the pump...until I find the leak that is.
    + 2016 D4 TDV6

  9. #9
    Homestar's Avatar
    Homestar is offline Super Moderator & CA manager Gold Subscriber
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    I run an accumulator in my van, and I get the odd tick from the pump - Iíve found in mine itís caused by some crap in the pumps non return valve as mentioned. Iíve pulled it all apart more than once and itís fine for a while, then starts again. My tank is 50 years old and has some strange stuff in it - green slime that clogs the tap up too - no, I donít drink the water and a new tank is on my list of things to do.

    Maybe thereís a bit of crap made itís way into the inlet of the pump that is just holding the non return open just a smidge.

    And Iíve found since fitting an accumulator that the water flow is smooth like youíd have at home and not jittery like it was before fitting one - no, you donít need one, itís just a nicety. 👍


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