[Pipgan]

I have a Jabsco electric head on my 2005 2900 coronet. The bowl fills over time to the point that it splashes over in 2-3 ft seas. I evacuate the bowl to a very small volume after use. I assume that there is a valve that I can close to prevent the bowl from filling, but it is not apparent to me. Please offer advice...

[YOLO]

I'm not familiar with the Jabsco units but that doesn't sound right to me. I would turn off the fresh water system until you can find the answer. There must be a bad valve or seal of some kind?

[Chris Burkard]

Your head has a turn knob to flush. If you turn it to the right, it flushes and fills the boat will water at the same time. If you turn it to the left, it flushes and does not refill bowl.

Good Luck!

[stugiv]

I think I understand his problem. After emptying the bowl with the 'dry' flush, water slowly leaks back in mostly likely from the exit hose thru leaking seals. My boat does something similar, although it only comes up about 1" above where the exit hole widens. If the hose or tank were positioned at a different level, I suppose it could fill the bowl higher in another boat.

I suspect a rebuild kit would fix the problem, but I haven't taken the time to fully investigate.

[Chris Burkard]

Sorry, I misread the original post. Yes, sounds like the fill valve is leaking. Replace the valve and your troubles should go away.

Good luck!

[Northporter]

I seem to have the same issue developing with my head. 2001 Coronet. Curious if you could provide a follow up report?

[Northporter]

After having my holding tank pumped over the weekend my bowl does not fill over time. The holding tank is located at a level nearly as high as the head so I assume this means that a check valve of some kind is in need of repair? Also discovered that the tank is opac and so you can visibly inspect the level of waste in the tank.

[Chris Burkard]

There are in-line valves from the toilet to the tank and from the tank to overboard discharge. They are one way valves called duck-bill valves. Flushing the toilet when the tank is full can over pressurize the tank and cause pressure to pulse back to the toilet inverting the one way valves in the wrong direction. This would then allow waste to travel from the tank (especially if it was full) to the toilet. If you have overfilled your holding tank, you will now have to replace the charcoal vent filter in addition to replacing the duck-bill valves. The charcoal filter is designed to filter fumes, not liquid. Once liquid enters the filter, it is ruined. If you don't replace it, your boat will begin to smell like a sewage treatment plant within a few days.

Good Luck!

[justrollin]

Is Tiara the only place to get these filters, and if not any idea what make and filter # they might be?

[Betterdays123]

My 32 Tiara uses a Saniguard in line filter.
You can get them at any online marine store.
It should be within 2-3 feet of your vent.
Usually tucked Behind your holding tank close to your pump out fitting.
Mine is on the portside between the holding tank and the exterior wall of the boat.
Not cheap...mine is close to 200 bucks.