[C320-list] Head backing up

[Dave Hupe]

I had the same thing happening recently until I flushed it out well by pumping with clean water several times.  So, it was probably debris partially keeping the joker valve open like Graeme mentioned.  I had replaced the joker valve last season and it was really easy and cheap. I believe Rollie means joker valve, not duckbill. 
Dave Hupe1994 C320 #32
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  On Thu, Aug 20, 2020 at 4:18 AM, Arthur Gates<argates2nd at comcast.net> wrote:   Change the duck bill. Part is $15..
I change it every year. 
Rollie. #182

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> On Aug 20, 2020, at 3:15 AM, Graeme Clark <cg at skyflyer.co.uk> wrote:
> 
> Here’s a “how to” video https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwj3wNflnanrAhUfUhUIHQ7DDqcQwqsBMAF6BAgMEAg&url=https%3A%2F%2Fwww.xylem.com%2Fen-uk%2Fsupport%2Fvideo-library%2Freplace-a-jabsco-joker-valve%2F&usg=AOvVaw1hgUsRBsTCOl0Ritv7hnQg
> 
> Sent from my iPad
> 
>> On 20 Aug 2020, at 08:13, Graeme Clark <cg at skyflyer.co.uk> wrote:
>> 
>> Your joker valve needs replacing.  This is the one way valve at the base of the pump where it enters the waste pipe.  It may have just got a piece of “debris” stuck in it that prevents it sealing properly or it may have lost its elasticity or perished.
>> 
>> It’s a very cheap quick and simple repair and not too messy, but rather smelly!
>> 
>> If there is significant backpressure (ie holding tank is pressurising due to blocked vent) it can invert but you’d know that because it’s then almost impossible to pump out!
>> 
>> Graeme
>> 
>> 
>> 
>> Sent from my iPad
>> 
>>>> On 20 Aug 2020, at 05:11, David Veeneman <davidv at veeneman.com> wrote:
>>> 
>>> I have recently noticed a Robles with the Jabsco head on Adelante. After I pump the bowl dry, the system backs up a bit, and fifteen minutes or so later, the bowl is about 2/3 full of liquid waste.
>>> 
>>> This happens when I am using the holding tank. I pump the bowl dry, lock the handle, and leave the pump lever in the ‘pump dry’ position. Until recently, when I pumped the bowl dry, it stayed dry.
>>> 
>>> Any thoughts as to what might be going on? Thanks.
>>> 
>>> —
>>> David Veeneman
>>> SV Adelante, Hull#131
>>> Dana Point, CA
>>