Jabco toilet issues

[play n hooky]

Good day folks, problem I have in my forward head
Syphoning of raw water in to holding tank. Water is coming through seawater intake
Regards

 

[High Wire]

Model? Electric or manual?

 

[Cigatoo]

Good day folks, problem I have in my forward head
Syphoning of raw water in to holding tank. Water is coming through seawater intake

You should have a vented loop / vacuum break in the sea water intake hose that will prevent siphoning. See the link below.

https://shop.hamiltonmarine.com/pro...--10598.html?gclid=COnuvICGvtMCFRhLDQodLOAPzA

 

[play n hooky]

She is an electric system. Will check for the vented loop on the system

 

[High Wire]

Did this problem just start happening to what used to be a properly working head or is this a new installation?

Not so simple as having a anti-siphon loop. It must be installed at the proper height IF the head is below waterline. I will ass/u/me it is below WL because of the problem described. There also needs to be a solenoid on the vent that closes when the pump runs or else the seawater side of the pump will only suck air when running.

http://www.xylemflowcontrol.com/files/37010_43000-0612.pdf

 

[play n hooky]

Easting I think you got it right
Found an old valve on the (and I mean old like original) and she is plugged on the air vent
Will post a picture if i can but if the plastic one fits I will order
Regards

 

[play n hooky]

 

[play n hooky]

I expect this to be the issue

 

[play n hooky]

Yes the head worked fine up to last year

 

[play n hooky]

No wires to this valve? Going to take it apart after the anti seize sets in