Hi Peggy, I have your book and I cant find the answer to my problem. the jabsco toilet on my 98 Hunter 376 empties fine both wet & dry back into the holding tank, but flushing overboard feels blocked with back pressure and will not empty. I have done the following: -replaced/cleaned both loop vents. -Pulled hose from thruhull and water runs freely up in-thru thru-hull when opened. -Pulled waste hose from diversion valve and it runs freely thru to thru-hull. Any suggestions?? Thanks. Bob
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Check other connections
I once had the hose come off the deck pump out fitting. That allowed air into the overboard discharge hose and T. Tank would not pump out. I could not figure out what was wrong. I shined a bright light into the deck plate and saw the hose edge about an inch below the underside of the fitting. Two hose clamps had come loose! Reattached the hose [ not at all easy] and everything worked fine.
I once had the hose come off the deck pump out fitting. That allowed air into the overboard discharge hose and T. Tank would not pump out. I could not figure out what was wrong. I shined a bright light into the deck plate and saw the hose edge about an inch below the underside of the fitting. Two hose clamps had come loose! Reattached the hose [ not at all easy] and everything worked fine.
Vent opening?
Bob: Are you sure that the actual vent is clear? I would suggest that you run water in the vent to be sure that some critters have not built a nest in there.
Bob: Are you sure that the actual vent is clear? I would suggest that you run water in the vent to be sure that some critters have not built a nest in there.
Hmmmmm....
What we need to do here is apply the same logic Sherlock Holmes used to solve mysteries: when you've eliminated all the impossibilities, what's left has to be the answer. If you're not having any problem flushing into the tank or dumping the tank, the tank vent is fine...and besides, the tank vent has nothing to do with flushing directly overboard. If you've made sure that the y-valve is open to the thru-hull...that the toilet flushes just fine through the y-valve--no blockage in the hose between the toilet and the y-valve...you've made sure that the seacock does open the thru-hull...there's only one thing left: a blockage or partial blockage in the section of hose between the y-valve and the seacock. It may be waste, or it may be that sea water mineral buildup has reduced the diameter enough to restrict flow and create backpressure. Make sure there isn't a partial blockage in the thru-hull too...maybe a sea critter has set up houskeeping on the outside of it, partially blocking it. That would let some water in when you tok the hose off, but create enough of a restriction to interfere with flushing the toilet.
What we need to do here is apply the same logic Sherlock Holmes used to solve mysteries: when you've eliminated all the impossibilities, what's left has to be the answer. If you're not having any problem flushing into the tank or dumping the tank, the tank vent is fine...and besides, the tank vent has nothing to do with flushing directly overboard. If you've made sure that the y-valve is open to the thru-hull...that the toilet flushes just fine through the y-valve--no blockage in the hose between the toilet and the y-valve...you've made sure that the seacock does open the thru-hull...there's only one thing left: a blockage or partial blockage in the section of hose between the y-valve and the seacock. It may be waste, or it may be that sea water mineral buildup has reduced the diameter enough to restrict flow and create backpressure. Make sure there isn't a partial blockage in the thru-hull too...maybe a sea critter has set up houskeeping on the outside of it, partially blocking it. That would let some water in when you tok the hose off, but create enough of a restriction to interfere with flushing the toilet.
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