Ivan K Posted December 20, 2023 Share Posted December 20, 2023 I once lost half a tank after overfilling, while on the way. Still don't understand because I overfilled it more than once and that was the only time. Also did not think that the vent tube would go that deep but don't know. And I don't have gravity fill either. Link to comment Share on other sites More sharing options...
96 EVO Posted December 20, 2023 Share Posted December 20, 2023 4 minutes ago, Ivan K said: I once lost half a tank after overfilling, while on the way. Still don't understand because I overfilled it more than once and that was the only time. Also did not think that the vent tube would go that deep but don't know. And I don't have gravity fill either. Yep, once that siphon starts 😁! Lots of owners drill a small hole in the high point in the overflow line to break the vacuum. If they overfill the tank they will get a bit of spray out of the hole, but it beats collapsing the tank! 1 Link to comment Share on other sites More sharing options...
Solution Venturer Posted December 20, 2023 Author Solution Share Posted December 20, 2023 (edited) The wet bay is dry this morning. All of this frustration because someone pulled the vent tube out of the exit hole and forced it up over another tube at the top of the black tank. I can see no reason for doing that. I couldn't see it till I removed the outer panel that held the Aqua Hot monitor. A technician had to have done it while servicing the AH, however, I see nothing gained by pulling the tube up. Regardless of the reason, I'm a happy camper. Now, it's on to getting the fresh and grey tank level sensors working. Edited December 20, 2023 by Venturer 3 Link to comment Share on other sites More sharing options...
major_west Posted December 20, 2023 Share Posted December 20, 2023 That's great news Doug! Coincidently, last week I also noticed water in my wet bay after overfilling the fresh water tank. The leak stopped when I drained the tank to 1/4 full. This thread gives me some hope it's the gravity fill or overflow hose and not a leaky tank. Link to comment Share on other sites More sharing options...
dennis.mcdonaugh Posted December 21, 2023 Share Posted December 21, 2023 I don't think my 2000 Dynasty has a gravity fill. Link to comment Share on other sites More sharing options...
Jlalpaugh Posted March 24 Share Posted March 24 I have the exact same issue. I over filled my fresh water tank and ever since I have had dripping water. If the rv is level then it drips into the wet bay, if it’s tilted then it drips out one side or the other. Any suggestions? Thanks Link to comment Share on other sites More sharing options...
Venturer Posted March 24 Author Share Posted March 24 I find it hard to believe the overflow tube could syphon out half of the fresh water without collapsing the tank. I'm going to drill a small hole at the top elbow of the overflow tube to break the possible suction. I would think leaving the gravity fill cap loose would also allow air into the tank and stop the siphon effect. After I replace the fresh tank sending unit, I'll refill and determine if I still have a leak or if the loss was caused by the overflow. Link to comment Share on other sites More sharing options...
Venturer Posted March 29 Author Share Posted March 29 I replaced the fresh tank sending unit. I entered the empty tank raw data into the Alladin. Then filled the tank and entered the full raw data. It then registered 100%. After a couple hours, it registered 98%, then 2 hours later was at 96% and the next morning it registered 93%. The actual tank level remained full. I'll monitor it today and reset the raw data to read 100% before night. Is this a normal setup for a new sensor or is there an issue with the Alladin system itself? The Black and Grey tanks seem to register correctly. Link to comment Share on other sites More sharing options...
Ivan K Posted March 29 Share Posted March 29 My old systems readings varied with battery voltage. May not be your problem but maybe something to compare. Finally went with SeeLevel. 1 Link to comment Share on other sites More sharing options...
Venturer Posted March 29 Author Share Posted March 29 Moderator EDIT This was moved from a different topic and should be here. End of EDIT. I was intending to take the pressure tank out when I had the tank empty to replace the sending unit, but it slipped my mind. It's full now. Can I still remove the tank without losing more than what is in the failed pressure tank itself? Link to comment Share on other sites More sharing options...
Benjamin Posted March 29 Share Posted March 29 Yes, you can remove the pressure tank after shutting off the pump and releasing the pressure at any faucet. The water from the unpressurized tank might dribble out, but you can stop it with a cork or finger if there's no valve. 1 Link to comment Share on other sites More sharing options...
Venturer Posted March 29 Author Share Posted March 29 I was hoping that was the case. It's an awkward place to get into and I doubt I can talk my wife into doing it, so I'll psych myself up for it. Thanks Link to comment Share on other sites More sharing options...
Ivan K Posted March 29 Share Posted March 29 It will drain some and will feel heavy if you have to reach far. It surprised me when it slipped out of the ceiling mount. Link to comment Share on other sites More sharing options...
Benjamin Posted March 29 Share Posted March 29 A failed tank may be full of water that doesn't drain. Unless the tank is leaking, they fail by losing the air pressure, and/or waterlogging the air side. Water will come out the schrader valve if you can hold the tank "upside down" and add a little air to force the water back out with the valve core removed or held open. If there's low air pressure but no water, you can just add air. Link to comment Share on other sites More sharing options...
Venturer Posted March 30 Author Share Posted March 30 (edited) I tried adding air, however, the diaphragm was damaged. I was able to remove the tank without any problem outside of the awkward position. I lost less than a 1/2 cup of water, but the pressure tank was full. The line has a brass elbow that I could clamp a 5/8" nylon reenforced tube with a plug in it where a compression fitting for the tank was. Or, cut the water line off and slide a cap onto it. I'll see what Lowes might have for that tomorrow. Edited March 30 by Venturer Link to comment Share on other sites More sharing options...
Venturer Posted March 30 Author Share Posted March 30 A simple slide on cap after cutting the brass elbow off was an easy solution. Now there is considerably more room in the pump location. As for the syphoning of the water from the fresh tank, I was going to drill a relief hole in the elbow leading down to the exit hole. However, the elbow is brass and a difficult area to get a drill in. Wouldn't leaving the gravity fill cap loose break the vacuum of the syphoning effect? Then after a few gallons of water were used tighten the cap. Link to comment Share on other sites More sharing options...
96 EVO Posted March 30 Share Posted March 30 Should! Link to comment Share on other sites More sharing options...
Venturer Posted April 1 Author Share Posted April 1 While hooked up to a water source to check for a leak, I found one. The brass incoming check valve is leaking. I would like to replace it with the same model. It's the original two piece one with garden hose washers. The incoming fitting swivels and the output side reduces down to 1/2" pipe thread. Does anyone know where I can buy a replacement? Link to comment Share on other sites More sharing options...
Venturer Posted April 2 Author Share Posted April 2 (edited) I found a valve that I can make work. The surprising thing I found is that the Monaco valve inlet was female garden hose thread, however, the fitting that screwed into it was 3/4" pipe thread that sealed against a garden hose washer. The output side was garden hose male that had a brass adaptor to 1/2" pipe thread. It all looked OEM, but I have to wonder why Monaco would have used a check valve intended for a residential garden hose. Edited April 3 by Venturer Link to comment Share on other sites More sharing options...
Jlalpaugh Posted April 12 Share Posted April 12 Is it possible to replace a fresh water tank in a 2008 Monaco Cayman. Link to comment Share on other sites More sharing options...
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