I replaced the vented loop in the water take-up line for the toilet. All it does now when I pump the toilet is suck air. This is a pretty simple thing but I am missing something because if I cover the air hole in the loop, the toilet pumps perfectly. I'm not certain as to how these things are supposed to work but what am I doing wrong. The joker valve is installed properly. Sure would appreciate your advice
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Works but not well
Same result with the installation in the head of my 33. A lot of pumping will make it work. I put the loop inside the head attached to the aft wall. You are right covering the top hole on the loop makes the pump work much better. As you can see from the picture a valve on the intake makes me sleep even better.
Same result with the installation in the head of my 33. A lot of pumping will make it work. I put the loop inside the head attached to the aft wall. You are right covering the top hole on the loop makes the pump work much better. As you can see from the picture a valve on the intake makes me sleep even better.
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Worked before?
You state that you "replaced" the vented-loop. Did the old one use to work? It sounds as if the vent is in the wrong hose. It should be after the pump and before the bowl. Not between the water intake and the pump. I have two vented-loops, one on the outlet hose on the way to the holding tank and the other between the pump and the bowl. The Related Link might help.
You state that you "replaced" the vented-loop. Did the old one use to work? It sounds as if the vent is in the wrong hose. It should be after the pump and before the bowl. Not between the water intake and the pump. I have two vented-loops, one on the outlet hose on the way to the holding tank and the other between the pump and the bowl. The Related Link might help.
I think you both put the loop in the wrong place
If it's installed between the thru-hull and the pump, it does just what both of you are experiencing. The pump PULLS water from the thru-hull to the pump...because the vent in a vented loop pulls air into the line to break a siphon, it won't let the pump prime...and if the pump can't prime, it can't pull in any water. It works when you put your finger over the hole because that cuts off the supply of air that prevents the pump from priming. Otoh, the pump PUSHES water into the bowl, something that the vent in the loop cannot interfere with...Worst case, if the one-way air valve in the hole that only allows air in but nothing out is missing, water will just squirt out of it as it goes by. And that's why any vented loop in the head intake should not be in the line between the thru-hull and the bowl, but between the pump and the bowl...to replace that short piece of hose that comes off the top of the bowl and goes to the fittng in the back of the bowl. The above applies to manual toilets only...if your toilet is electric, the loop has to go between the thru-hull and the pump...but you can't use a vented loop, it has to be an electric solenoid valve that's wired to the flush button and closes the air off when the button is pushed so that the pump can prime.
If it's installed between the thru-hull and the pump, it does just what both of you are experiencing. The pump PULLS water from the thru-hull to the pump...because the vent in a vented loop pulls air into the line to break a siphon, it won't let the pump prime...and if the pump can't prime, it can't pull in any water. It works when you put your finger over the hole because that cuts off the supply of air that prevents the pump from priming. Otoh, the pump PUSHES water into the bowl, something that the vent in the loop cannot interfere with...Worst case, if the one-way air valve in the hole that only allows air in but nothing out is missing, water will just squirt out of it as it goes by. And that's why any vented loop in the head intake should not be in the line between the thru-hull and the bowl, but between the pump and the bowl...to replace that short piece of hose that comes off the top of the bowl and goes to the fittng in the back of the bowl. The above applies to manual toilets only...if your toilet is electric, the loop has to go between the thru-hull and the pump...but you can't use a vented loop, it has to be an electric solenoid valve that's wired to the flush button and closes the air off when the button is pushed so that the pump can prime.
Thanks, I believe you are right
Thanks, Ed and Peggie, what you say makes sense. I will change my set up.
Thanks, Ed and Peggie, what you say makes sense. I will change my set up.
electric head
Peggy, I just installed a Jabsco electric head last year and the directions recommended a vented loop between thru-hull and the electric water pump. I actually had problems with the pump leaking, until I realized that the loop was just a hair under the water line, and the pump couldn't take the incoming water pressure. Point is, the electric head works fine with the vented loop. Although your point makes sense, I'm not sure how its priming--but I can assure you that Jabsco recommended to do it this way.
Peggy, I just installed a Jabsco electric head last year and the directions recommended a vented loop between thru-hull and the electric water pump. I actually had problems with the pump leaking, until I realized that the loop was just a hair under the water line, and the pump couldn't take the incoming water pressure. Point is, the electric head works fine with the vented loop. Although your point makes sense, I'm not sure how its priming--but I can assure you that Jabsco recommended to do it this way.
Wrong place
Thanks guys; good advice. I had read in the archives that the loop should go between the toilet and the pump but when I bought the boat it was between the lake and the pump. I couldn't see how the Hunter could make a boat and not have the loop in the correct place but I guess in those days the loop was not included and the previous owner put it in the wrong place. So I guess the old loop worked fine but it was in the wrong place I'll change it this weekend. Thanks again.
Thanks guys; good advice. I had read in the archives that the loop should go between the toilet and the pump but when I bought the boat it was between the lake and the pump. I couldn't see how the Hunter could make a boat and not have the loop in the correct place but I guess in those days the loop was not included and the previous owner put it in the wrong place. So I guess the old loop worked fine but it was in the wrong place I'll change it this weekend. Thanks again.
Thanks Peggy
Peggy, I looked on Jabsco's site at the installation instructions, and you were right. That explains why I had water leaking for a while, but I thought the vented loop needed to be raised. Once I did that, the leaking stopped--because the vent in the loop stopped the incoming water pressure. Here's the interesting part, why it works right now--although I plan to fix it. The vented loop is just a hair above the water line, just enough so that it doesn't siphon and put water pressure on the pump. The reason it works is because the only part of the hose from the thruhull to the water pump that doesn't have water in it all the time is the very short distance (maybe an inch or so) from the vented loop to the waterline in the hose going to the thruhull. So the hose is basically full of water, without putting pressure on the pump itself. Anyway, I sent an annoyed email to Jabsco because the solenoid valve never came with the unit, and I just missed that part in the instructions. Thanks for the heads up.
Peggy, I looked on Jabsco's site at the installation instructions, and you were right. That explains why I had water leaking for a while, but I thought the vented loop needed to be raised. Once I did that, the leaking stopped--because the vent in the loop stopped the incoming water pressure. Here's the interesting part, why it works right now--although I plan to fix it. The vented loop is just a hair above the water line, just enough so that it doesn't siphon and put water pressure on the pump. The reason it works is because the only part of the hose from the thruhull to the water pump that doesn't have water in it all the time is the very short distance (maybe an inch or so) from the vented loop to the waterline in the hose going to the thruhull. So the hose is basically full of water, without putting pressure on the pump itself. Anyway, I sent an annoyed email to Jabsco because the solenoid valve never came with the unit, and I just missed that part in the instructions. Thanks for the heads up.
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