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Old 05-01-2016, 05:59 PM   #1
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I have a 2005 350xl that I recently acquired and am in the process of making it road worthy. I have encountered a strange issue that I hope some of the more experienced folks here can help.
Whenever I introduce water into the coach through the city water inlet or have the pump pressurizing the system, water sprays out of the black water flush inlet that is right next to those inlets in that bay. Shouldnt those systems be separate and isolated from each other? Before I tear it apart I was hoping someone could shed some light on where to look.
Thanks
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Old 05-01-2016, 06:45 PM   #2
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Originally Posted by rdprice View Post
I have a 2005 350xl that I recently acquired and am in the process of making it road worthy. I have encountered a strange issue that I hope some of the more experienced folks here can help.
Whenever I introduce water into the coach through the city water inlet or have the pump pressurizing the system, water sprays out of the black water flush inlet that is right next to those inlets in that bay. Shouldnt those systems be separate and isolated from each other? Before I tear it apart I was hoping someone could shed some light on where to look.
Thanks
If the clean-out was factory installed and not modified then yes it is supposed to be a self contained, isolated, system not tied to any other water system. Even after market clean-outs, I believe are independent. Here's a typical factory install.
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Old 05-01-2016, 07:36 PM   #3
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Thanks for the reply...there is another sewer flush in the electrical bay...what is that for?
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Old 05-01-2016, 07:57 PM   #4
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I don't have a 350XL but if you have a second, aft bathroom (toilet), that could be the clean-out for it (second black tank). Maybe someone with more knowledge of your coach will chime in. There could also be info on line.
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Old 05-02-2016, 12:07 AM   #5
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I just looked it up in NADA to see a floor plan but it wasn't there and just for info you have and 06 model motorhome. the chassis may be 05 but the 350xl motorhome wasn't offered till 06, nada doesn't show a 2005 350. Make sure you register it as a 06. Do not go by the chassis vin date, the chassis may sit in the yard for a year or two before getting a body. Mine is and 06 but has and 04 chassis.
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Old 05-02-2016, 08:07 AM   #6
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Yes, you are correct. after all if the flush was connected to the FW system, why both with a separate input connection for the flush? There is a check valve but they are not trusted...hence the separate connection. Besides, there would have to be a valve somewhere since otherwise the flush would be working whenever there was presure in the FW system.
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Old 05-02-2016, 11:13 AM   #7
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I meant to type 370xl, not 350xl. My mistake.
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Old 05-03-2016, 02:00 PM   #8
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The back flush valve usually is in the cabinet under the sink in the bathroom, it rises as high as possible under there, has to be higher than the overflow level of the toilet. Look under the sink at the back of the cabinet and see if you can find the back flow preventer. So finding the line you can then follow from there to see if or how it is connected to the FW line.
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