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Car Forum / Driving, Maintenance, Tuning / RVs / August 2006Grey Tank Question (semi-long)
Hi All, The previous thread (Help with black holding tank) got me thinking, and looking: I have a '96 Glendale Golden Falcon 29RG, rear kitchen. On the roof is one vent, underneath I have two small (grey tank) drainage valves and one large (black tank) one. Inside under the kitchen counter I have an inside vent, the same under the bathroom sink. The problem is if I leave the most rearward drain valve closed, the kitchen sinks, very soon after dumping, don't drain. I open that valve and all is good. I can hear the undersink vent make noise if I fill the sink and then let it drain, the valve emits a 'burping' noise for quite a bit after the sink itself is empty. The manual that came with the trailer is quite generic and shows only one grey tank/valve and so is useless to diagnose this, and when I emailed the manufacturer for more detailed info they sent me a duplicate of said manual. I don't have a problem per se, but am curious as to the design and the function of the two grey drain valves; are there two grey tanks, and if so is the kitchen one not draining when dumping? As usual, speculation is expected, even welcomed, but even better would be hard facts. Tim (a lurker) Barr. > Hi All, > [quoted text clipped - 24 lines] > > Tim (a lurker) Barr. Any response will be speculation/assumption since no one can see what you are dealing with. So here goes: ANY tank that has a fluid running it to it must have a vent(s) in order function properly. If you sink is draing slow, there's a problem. More than likely there is a clog. The clog could be in the drain itself (due to hair, grease and etc.) or it isn't being vented properly. When water is drained INTO a tank, air/gases has to get out to allow room for the incoming fluid. This is why there is an OUTSIDE vent (which may or may not be connected to the same vent as the black water tank. If this vent is blocked, by who knows what, it will not allow the liquid to enter the tank in a timely fashion. Also, air has to be able to ENTER the drain line to allow the fluids to FLOW by means of gravity. IF the inside vent isn't working properly (opening), the flowing liquid MAY cause a vacuum behind it and therefore causing slow drainage. IF the inside drain isn't closing, odors and gases can escape within the MH. Hope this helps. I am not a writer. I tried to be as concise as possible. Good Luck Hank <~~~last post in regards to VENTS. :-) >"Tim Barr" <tim_j_barr@hotmail.com> wrote: >The problem is if I leave the most rearward drain valve closed, the kitchen >sinks, very soon after dumping, don't drain. >I open that valve and all is good. >I can hear the undersink vent make noise if I fill the sink and then let it >drain, the valve emits a 'burping' noise for quite a bit after the sink >itself is empty. Sounds like the gray tank venting to the roof is plugged. I have a friend with an expensive 2005 diesel pusher, and there is only one vent on his roof, suggesting that the gray and black venting systems are combined somewhere in the coach. (His does have separate gray and black water tanks.) Perhaps the same is the case with yours. Got a coat hanger? <g>  SignatureDD >Hi All, > [quoted text clipped - 26 lines] > > I think you have one grey tank with a drain valve and the kitchen draining in to it with a shut off valve. Look for a garden hose connection to the kitchen drain line with a cap on it. This would be used for grey water drain where at one time it was allowed in some places. The grey water tank drain might be valved to allow back flush of the black water tank after it has been drained. This is accomplished by closing the black water or main 3" valve after all the black water has drained and opening the front grey water valve allowing the grey water to enter the black water tank. You then reopen the main dump valve and finish draining every thing. This is just a guess, it is the way mine is plumed, except I have a grey tank for the galley. I take it your 96 Glendale Golden Falcon 29RG is a fifth wheel. SignatureBILL P. Just Me & DOG
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