[C320-list] Head backing up

[Graeme Clark]

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
>