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Originally Posted by Michael
Couple of questions regarding gray and black water tanks. First, on our "maiden" voyage over Easter weekend our shower backed up...supposedly we have two gray water tanks..evidently there is no crossover or overflow line between the two tanks since only one showed full on the gauges??? Secondly can we not empty our gray water without emptying the black water? I am a little crippled up and cannot crawl underneath the unit. Also is there an inlet to flush the blackwater while the dump valve is open? Thanks for any help....
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You "should" be able to dump the grey water without dumping the black. They are supposed to have separate valves. Typically there is not a crossover between grey tanks. You can install one, maybe. What I do to figure out what is what is: empty all the tanks, then run water into a sink, shower or whatever until it registers on the indicator, then I know what is plumbed to which tank. This is assuming you cannot track the plumbing to the tanks. On more than one occasion I have seen where a bathroom sink was plumbed to the black tank.
You may or may not have a black tank flush. Some units have them some don't, if you do, you most definitely want to keep the black tank valve open while using it. If you have one there should be a hose hook-up labeled for it.
Aaron