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Old 09-18-2018, 07:19 PM   #1
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Plumbing

Just purchased a 2014 Crossroads Monticello RF35MC 3 weeks ago. Nothing but problems. Major problem now. Black tank full after being dumped (I thought) 2 times a week. Checked under and it is a 3” pipe from toilet but when it comes out under Coach it is a 2” pipe at best. It then hooks to a 3” connector for sewer hose to hook to. How can this be right? New to RVing.
Please help.
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Old 09-18-2018, 07:58 PM   #2
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I believe that is standard plumbing for these things.


Question for you. You say the black tank has been dumped two times a week.
Do you leave the gate valve closed until it's full and then dump?
Reason I ask is it sounds like maybe you have what we refer to as a "poop pyramid". Also when you flush are you using PLENTY of water?


Maybe the previous owner didn't use the bathroom and black tank correctly.


If that's the case you will have to get a water hose in there and hopefully wash/flush it out.
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Old 09-18-2018, 08:19 PM   #3
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Thanks Lloyd. I live in our camper at a campground that does not have sewer. They come around and dump the tanks 2 times weekly. He has a 200 gallon tank in a trailer he uses and then dumps it in a dump station in premises. I haven’t talked to the guy that has been dumping. I was concerned when I saw a 2” pipe for the drain. Gray and Black tank together. I am confused
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Old 09-18-2018, 08:22 PM   #4
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Hello and welcome. If you are on full hookups try to open all the valves to see if that will empty the black tank. I may be wrong but you should have remote valves operated by a cable. You may have to open the underbelly to see but the cable may be broken. Also then you could check which handle goes to which valve. My campers have all been older and the valves exposed but the black was 3" and the gray was 1.5".

And if all that checks out Lloyd may be correct as with the valve open the "liquid" runs out and leaves the "solids" behind. If that is the case you will have to remove the "blockage" either thru the outlet or down the toilet.

When we bought ours it was on a seasonal lot and they left the gally tank open leaving a grease dam that was very hard to remove but we got it. Very thankful it was not the black tank.

Probably not what you wanted to hear but its a place to start. Good luck!
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Old 09-18-2018, 08:22 PM   #5
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What do you mean---Gray and Black tank together?
They each should have their own gate valve that closes off the tank.
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Old 09-18-2018, 08:32 PM   #6
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I was wrong on my first post. It should be 3 in. coming from the black tank, and 1.5 for the grey. Just like dagst1 posted.
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Old 09-18-2018, 08:43 PM   #7
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One more thing You posted the black tank was full. Is this by the gauge or a visual looking down the toilet? Just be aware that sometimes the gauges are off - may show full when empty. If you can see a small pipe then a large pipe to connect the dump hose to that is probably the gray or galley tank.
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Old 09-18-2018, 08:43 PM   #8
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Thanks but I am not hooked to sewer. I have to wait for the maintenance guy to hook hie take up before I can open the black tank. But why is there only a 2” pipe for the black and grey tank.
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Old 09-18-2018, 08:45 PM   #9
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I know you are not mobile, but I would still try using the Geo Method to clean the tank. Worth a shot. https://sites.google.com/site/cbruni/
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Old 09-18-2018, 08:45 PM   #10
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I only have one dump hook up and the pipe is 2” max. What am I missing.
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