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Old 08-01-2019, 10:29 PM   #1
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Leaking water from underneath

Anyone seen anything like this....I have a 2017 FR Coachmen Chaparral 392mbl 5th wheel. This afternoon I arrived at cg and set up. 7 hours later I noticed that I am currently moderately leaking water (maybe 8 oz. per 10 minutes) from around the large 4" black waste water pipe. (It is slowing down now. ) Since there's almost nothing in the black tank, it doesn't appear to be a sewage nightmare. And this could possibly even be clean water just exiting the camper around the black pipe. I just don't know the cause. I opened the panel in the basement behind the water control panel and there is some dampness on the subfloor toward the middle of the camper near the large black pipe. I don't see any source or dripping in the compartment. Water is not evident anywhere inside the camper itself. I've hardly turned on any water since I arrived ... flushed once. I am using a quality pressure regulator that is set at 40 psi... but again, I'm guessing this is black or grey water tank related and maybe not a pressurized line? Not sure. I cut off the water as soon as I saw the problem. It's 11 p.m. so I'll look at it further in the a.m. Any ideas? Thx bg
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Old 08-01-2019, 10:41 PM   #2
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I collected some of the water... it's fairly clean & doesn't smell. It's also still dripping. Am now wondering if it possibly is related to running the ac for 6-7 hours... not a lot of water dripping off the side of the roof either. I turned off the ac for the night. Is it possible that this much water could collect somewhere then drain out underneath? Any help is appreciated thx! bg
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Old 08-03-2019, 08:18 AM   #3
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Leaking water from underneath

There should be no water In the underbelly. Good thing is that chaparrals have 4x8 sheets of coroplast that are easy to remove and take a look. The drain pipe is the lowest point in my underbelly so that is likely why the water is coming out there. During reassembly you can reseal the pipe pass-thrus with duct tape until u get black great-stuff to seal more permanently.

If the subfloor is wet then the leak is likely coming from the upstairs area or plumbing in the basement.

If the water is near the big black pipe (toilet to black tank?) in the basement perhaps a drain stack vent is unsealed on the roof.

I did have had two leaks in my Chaparral. One from not using a pressure reducer on the black tank flush (leak from bathroom sink air admittance valve into basement subfloor). The second leak traced back to the shower drain fitting being loose. The subfloor was wet about a foot behind the water control panel.

Some suggested locations to check-
-roof: is the ac water finding a unsealed plumbing vent stack?
-has it rained? Inspect the roof for unsealed areas that have a direct shot to the basement.
-since u flushed recently perhaps that plumbing is leaking while flushing.
-showered recently? Check the shower drain in the basement area with the shower running.
-toilet flush leaking in the bathroom? Would leak when pressing the flush pedal.
-bath or kitchen sink leaking?
-have u filled the fresh water tank recently? That plumbing is further back in the rear of the trailer. But the valves are at the control panel.
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Old 08-03-2019, 02:24 PM   #4
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Thx for your input. Everything "appears" to be ok right now. Since this was a plumbing issue of some kind, I felt more comfortable having a mobile tech look at it.

I'll try to be brief but there are a couple of things in play here. So the subfloor in the basement was wet... think of heavily damp not flooded since the excess was draining out. The water came from the shower drain pipe... gathering & exiting at the low shot around the perimeter of the 4" pipe between the toilet and black tank. It was leaking from 2 different couplings on this same pipe; the connection between the shower drain & pipe and then about 3 feet away at another coupling between pieces of pipe. I don't know if this second coupling was original plumbing or some kind of repair.... it was a white 12" PVC section between the black pipes. The fix was simple... tighten drain, recaulk in shower pan topside, and tighten the white coupling (which was almost completely unscrewed) and caulked also.

The real question is where did the water originate? Well it seems it could only come from grey tank overfilling and backing up. I had only been set up about 6 hours or so when I noticed the water leaking underneath. There wasn't a huge amount of damp ground on the pad... so this had not been happening for long when I discovered it.

The only thought we could come up with is that one of the handles on the "outside kitchen" small sink was open/on just slightly. There was traces of water in the sink but it certainly did not overflow out of this sink in its small compartment... everything outside of the sink was dry.

If my math is accurate, I figure that in order to fill the 40 gal grey tank over 6 hours it would need to run a little over 1 gal of water per 10-12 minutes... this timing seems to work... when I saw the sink handle it was only slightly open... so this seems plausible. The only thing that does not fit this theory is that the outside sink sits lower in the rig than the shower pan. So I'd think that the sink would back up before the shower would (yes the shower was wet and it had not been used). Anyhow I'm going to keep a close eye on it.
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Old 08-03-2019, 02:44 PM   #5
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Quote:
Originally Posted by BG19 View Post
The only thing that does not fit this theory is that the outside sink sits lower in the rig than the shower pan. So I'd think that the sink would back up before the shower would (yes the shower was wet and it had not been used). Anyhow I'm going to keep a close eye on it.
If your outside sink has a HEPvO (waterless) trap instead of a standard p-trap, the HEPvO trap acts as a check valve and wonít allow water to flow back towards the sink.

If you want to know if you also have a water supply leak somewhere, an easy way to find out is to disconnect the city water, put some water in your fresh water tank and turn the pump on. If you hear the pump cycle from time-to-time with no water use, you have a leak somewhere on your water supply system.

Bruce
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Old 08-03-2019, 02:59 PM   #6
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I ought to disconnect the outside sink. We never use it and it's so easy to bump the handles into the on position. Will probably just make something that will block then from moving forward.

Good advice on the lines.. though I think we're good there. Thx Bruce.
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Old 08-03-2019, 07:36 PM   #7
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Thanks for following up it will help others in the future.
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2016 RAM 3500 DRW 4x4 LB LoneStar Edition, w/Timbrens, Andersen Ultimate 2, Swift Hitch SH04 WiFi Backup/Rear View Camera
2018 Chaparral 360IBL w/Tireminder SMART TPMS, Furrion Wireless Observation System, Progressive EMS-HW50C
2006 RAM 3500 DRW LoneStar Edition
2011 Starcraft 392BHU w/Andersen No-Sway hitch
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