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Old 04-25-2016, 02:58 PM   #1
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Plumbing problem

I have an '07' FR/CC 37RTDS with both galley and bath gray tanks. Suddenly my galley tank won't drain but the bath gray as well as the black water tanks drain fine. All three have separate open/close type Electric Drain Master Valves with another manual slide gate valve at a single 3" dump exit. With all three electric valves open, I filled bath sink and shower pan with water then pulled plugs, they drain fine. I flushed toilet with clean water, it drains fine. I filled kitchen sink with fresh water then pulled plug. It takes about an hour or so to slowly trickle out and fill up the bucket I have outside. All p-traps under sinks and shower pan are clean. My best guess is the galley gray water tank must be plugged at exit point. Any suggestions on how to fix this without having to tear things apart?

Also, any idea on where I can get a tank and plumbing layout on this rig. FR and dealer I bought it from (new) pretty much says tough luck Chuck. Fortunately the galley tank and electric valve is visible by removing the poly underbelly sheets. I've no clue where the bath and black water tanks and Drain Master Valves are in this beast. If one of those electric valves stick closed I'd probably have to disassemble the whole rig to get to them.
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Old 04-25-2016, 03:07 PM   #2
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Rdeemat

When they make the rigs they drill the holes out of the tank and they plastic hole sometimes drops into the tank and slowly works its way to the drain and just lays there and blocks the hole.
Try some type of back flush with only that valve open and see if it will move back into the tank and then check and see how it flows.

Good luck.
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Old 04-25-2016, 04:25 PM   #3
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Plumbing Problem

Thanks for the suggestion Iggy, not sure that could be it though. My rig never moves as I live in it perm. parked for the last 8 years with no problems. I leave all electric valves open with a Clean Dump Emulsifier at the exit point. Those electric valves scare me. Some day they will fail and if so I want them to fail open not closed. Two of the three are buried so far up in there it would cost thousands for a mobile RV repair guy to get to them for replacement.
PS: Can't travel no more, lost most of my vision to Macular Degeneration.
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Old 04-25-2016, 04:33 PM   #4
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I would pull the valve and have a look to find out what is plugging the tank and then remove it.
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Old 04-25-2016, 04:40 PM   #5
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The biggest issue with permanent site black tanks is the "Tower of Doom"; build up of solids that no amount of water, added later, can move.

You will need to stop using the tank for a several days (tough in a permanent site, I know). Add RID-X or RV-DIGEST-IT to the tank, fill it with water till you can see it in the stand pipe and wait 72 hours OR MORE. If you have a severe tower of buildup, you may need to drain, treat, and dump more than once.

Worst case is tank replacement, but get ready for a large repair bill. Try the RID-X or RV-DIGEST-IT treatment several times first.

http://www.amazon.com/Unique-Natural...s=rv+digest+it

http://www.amazon.com/Septic-System-...reatment&psc=1
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Old 04-25-2016, 04:51 PM   #6
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Herk.... the OP's problem is with the grey galley tank... Not the black tank.
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Old 04-25-2016, 05:58 PM   #7
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Thanks Oldcoot, easier said than done based on location of it, but may have to. Will drop the belly pan when it drys up and start digging into it. Major rainstorm last night got pretty wet under there.
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Old 04-25-2016, 10:15 PM   #8
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Quote:
Originally Posted by 5picker View Post
Herk.... the OP's problem is with the grey galley tank... Not the black tank.
The solution is still the same; just what is causing the problem is different.

Hair, soap, and decaying grease need to go and Rid-X or RV-DIGEST-IT will take care of those items too.
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Old 04-25-2016, 10:30 PM   #9
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Are you sure your galley grey tank is actually open?
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Old 04-25-2016, 11:44 PM   #10
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Op...is you kitchen sink in a a bar or island?
If so, then the galley tank may not have a vent like the other tanks. On some that have sinks in the bar or an island there is a "filtered" vent that is attached to the plumbing under the sink. You may check an see if this filter is plugged or something if you have this type of setup.
(Wish i had a pic, but havent thought to take a pic of this setup in my camper)
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