bucky
Raleigh metro
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Joined: 05/07/2003
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Google isn't always correct due to the info it receives. Our FR 5er lists one grey at 60 gallons. It really is 2 30 gallon tanks with one pull handle behind a round cosmetic port 4 feet from the wet bay and the other in the wet bay beside the black tank pull.
One grey is bath, the other is kitchen.
Looking at the 5er specs you might want to find a scale so that you know what you are dealing with truck spec wise.
2005 Cummins 3500 2WD LB quad cab dually pulling a 2014 Blue Ridge 3025RL
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down home
south
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Joined: 06/01/2008
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Do you flush your tanks or just rain them?
If you just drain them there is the cause of the problem...unless the valves are bad. They don't cost much and are easily changed but not a job i want with tanks backed up. If you determine the valves work and you have some capacity left in the black tank, pour a bottle of water softener in and good amount of detergent then ice, at least 20 lbs, if you can. Have it already hoked up and drive it on the roughest rad you can find for a couple hours. See if that helps. If not, perhaps, since I haven't tried it a snake up the outlet with the valves open of course..with a painters suit on or some such but don't be too aggressive you don't want to damage the valve seals or valve,I don't like this idea a lot, for obvious reasons but....
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schlep1967
Harrisburg, PA
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Joined: 12/08/2005
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I'll take my stab at this.
Following the title you are trying to rinse out your black tank(s).
Your post says you have two unmarked connections. I'm guessing for water hose hook-up to rinse the tank(s).
This is the hard part because every brand, model, year of trailer can be different. In my wet bay there are 3 places to hook up a water hose. A city water connection that goes straight into the water lines. An onboard water tank hook-up that fills my onboard fresh water tank. And a black tank flush hook-up.
My guess is that the one you are hooking up to that is not then running out of your black tank is filling your onboard fresh water tank.
2008 Dodge Ram 2500 Diesel
2009 Open Range 385RLS
Pull-Rite Super Glide
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frankwp
Calgary, AB, Canada
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Joined: 09/07/2004
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I have no idea if this will help because the OP hasn't provided any clarification. The black tank flush in my fifth wheel quit working, as in water would not flow. I unscrewed the nozzle from the tank to inspect it. It has a screen on the end & it was completely clogged with fibrous material. I cut the screen off & soldered on a short length of copper tubing with the end pinched a bit & reinstalled it.
The flush nozzle now has its discharge aimed in such a fashion that it causes a circular flow in the tank. It really flows a lot of water now.
2010 Cruiser CF30QB
2003 GM 2500HD, crew cab, SB, 8.1, Allison
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