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Old 08-22-2013, 01:09 PM   #1
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Dumping tanks problem

Hi, I have a 1981 Ford cutaway motorhome and everytime we dump water backs up in the tub, what is the problem. Can I use draino in the tub drain

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Old 08-22-2013, 02:15 PM   #2
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I wouldn't suggest using Draino because it's so caustic. If the Draino backs up into the tub it might cause some damage. Not sure what a 1981 Ford cutaway mootorhome' is, you might wish to put detail in your signature in the 'Users CP' tab at the top. In most RVs, the toilet and maybe the lavatory sink drains into the black tank and the kitchen sink and tub drains into the gray tank. Dumping the black tank wouldn't back into the tub unless you are opening the gray tank valve and the black one at the same time. Drain black first, then gray to flush it out.


Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 08-23-2013, 10:49 AM   #3
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Question do you have one or two tanks, If you only have one tank then check the tank vent on the top of the unit. If blocked ti will pull water from tub trap then fill into tub. Try opening the valve slowly at first and then full open.
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Old 08-23-2013, 07:10 PM   #4
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Some people call any rv with a cab over a cutaway- I'm guessing that's what they meant- if mot I am clueless.
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Old 08-24-2013, 06:58 AM   #5
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A "Ford cutaway" is the chassis it's built on, in this case likely an E-350 cutaway van chassis.

As was mentioned already, I suspect the problem is just opening both dump valves at once. You should open the black water (larger pipe) valve first, then when it's drained closes that valve and open the grey water valve to flush the hose out.
Ted 'n' Laurie, plus Jackson (aka Deputy Dog, the Parson Russell Terrier 'fur kid') and, Rylie (who crossed the Rainbow Bridge June 14, 2012).
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Old 08-24-2013, 06:25 PM   #6
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Well I have a 76 Ford Midas (an oldie but a goodie F-350) 26 footer and it Definately has two tanks.
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Old 08-24-2013, 06:30 PM   #7
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Welcome to the forum.

Assuming you have two tanks... I'm in the camp that believes both grey and black valves were opened at the same time. If that's the case, you could be pushing black water up into your tub, etc ... which isn't a good idea.

As mentioned, finish dumping black... close the valve and use the grey dump to clean out the hose.

Good luck.

Rick, Nancy, Peanut & Lola our Westie Dogs & Bailey the Sheltie.

2007 Itasca Ellipse 40FD
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Old 08-25-2013, 01:07 AM   #8
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Thanks for all your help guys, it is greatly appreciated!!

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