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Old 07-03-2015, 09:51 PM   #1
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Sealand 510 toilet won't fill with water

I have a Sealand 510 toilet that won't fill with water. When I leave it sit for a few days you can lift the pedal and it will fill with water and I can flush. After about 10 flushes the water just turns off somehow and when you lift the pedal to add water to the bowl it doesn't add water and when you push down to flush, it opens the ball valve but no water enters the bowl. Any ideas?
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Old 07-03-2015, 09:59 PM   #2
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How old is your RV?
Sound like you may have some debris floating around in the line ; that may require removing the supply line and checking for an inlet screen on the valve and maybe running water through the line while you have it disconnected.
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Old 07-03-2015, 10:03 PM   #3
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Water pump on or on city pressure?
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Old 07-03-2015, 10:05 PM   #4
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I have taken the supply line apart and looked at the screen and everything is clean. When I put it all back together it flushes with water 8 or 10 times and then no water..
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Old 07-03-2015, 10:06 PM   #5
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City pressure
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Old 07-03-2015, 11:56 PM   #6
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What changes between not working and working again?
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Old 07-04-2015, 06:41 AM   #7
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Nothing that I know of. If I take the toilet apart and put it back together it flushes for 8 or 10 flushes and then no water. Seems line a vapor lock kind of thing. I was originally suspicious about the vacuum breaker but I pulled the line out of the back of the vacuum breaker and flushed it and no water comes out of the hose.
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Old 07-04-2015, 01:38 PM   #8
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Have you disconnected the inlet line and just run water through it directly into your toilet? You have to determine if the problem is the toilet or your water system. Does the sprayer work when the toilet stops?

What are your rig specs? You can put them in your signature, it helps others when looking at your problem. My plumbing might be different than yours.
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Old 07-04-2015, 06:37 PM   #9
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I no longer have a rig. I have moved the toilet to an island in Canada and have it sitting over a SUNMAR composter for low flush toilets. I posted here because the RV community seems to be the most knowledgeable about these toilets.

It doesn't seem like it has anything to do with the toilet persay. I have now had it apart three times and I have to go all the way back to a compression fitting on my copper supply line before I can get any water to flow. Once I have water I can put it back together and I can get it to work for 8 to 10 flushes and then it just dries up. I let it run once while flushing and it ran for five minutes so it does not seem to be a volume thing. It just seems like 10 trips of the foot pedal and I am done. It has to be some kind of vacuum lock of some sort but it has me baffled. Sorry if I am not supposed to post here without being a current RV owner. I think most RV people have to be pretty resourcefull to keep a rig operating so I looked here first for help.
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Old 07-04-2015, 07:52 PM   #10
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When the toilet won't flush, will water flow from other faucets from the same water source?
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Old 07-04-2015, 11:27 PM   #11
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Can the water line be removed with pressure on to see if it pressurized, or are there other faucets etc inline that you can use to determine that?

There is nothing else to the toilet other than the water line, and the toilets valve for letting the flush/bowl fill happen? As long as you have pressure to the valve, if there is no flow beyond it then it's the valve.
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Old 07-07-2015, 07:36 PM   #12
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I fixed my problem. Not sure why but I had a compression fitting on the supply line from my water tank. I replaced it with a sweated solder copper Union and now things work. I'm not sure why but happy that it does. Thanks for the replies.
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