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Old 11-01-2016, 01:18 PM   #1
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Join Date: Jun 2011
Location: Red Wing, MN
Posts: 12
Blackwater tank flush

I have a 2008 Cruiser that I am having trouble with. When I dump my tanks, specifically the black tank, after dumping I connect a hose to the flush and let the water run through until clear water runs out. Yesterday I attached the hose to the flush and no water would pass into the black tank. It's as though there is a full blockage before the black tank. Is there a one way valve in that line to the black water tank that is stuck closed? Can anyone tell me what is between the hose connect and where the water sprays into the tank? Would like to know before I open the fabric under the trailer. HELP PLEASE!!
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Old 11-01-2016, 02:02 PM   #2
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Location: Oak Harbor, WA
Posts: 2,008
Sparky, I don't believe the 2008's had a check valve - my 2007 does not. At the end of the hose, attached to the tank is a plastic screen fitting that gets clogged with fine paper threads. When this clog dries, it is almost impossible to clear the clog with just the pressure from the hose. The filter/fitting needs to be removed and cleaned by hand.

On my rig, the fitting is towards the curb side of the rig, on the long back side of the tank. I have had to clean mine a couple of times. I access the fitting by pulling down the membrane from the curb side about 2-4 feet along the edge of the RV. I can then reach my arms in to remove the hose and fitting without pulling down the entire membrane. BTW, it wasn't clear in your writeup, but to properly flush the black tank, you need to fill the tank up with the blade valve closed (after you have dumped) and then drain the tank. I do this two to three times when flushing.
Stan and Terri
Oak Harbor, WA
2008 Chevy 2500HD D/A
2007 Cruiser CF30SK
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Old 11-01-2016, 06:36 PM   #3
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Join Date: Oct 2009
Location: Texas
Posts: 614
When I had a clogged flush I bypassed the vacuum break and poured Clorox in the line and let it soak. I then applied air pressure and it cleared.
2010 Cruiser CTX CT29RLX
2009 F-150XLT
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Old 11-01-2016, 06:41 PM   #4
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All good advice.
*2016 CAF25SE Cruiser Aire 5er/*Joined 2010 *Changed Username and lost Post #'s -2012.
*Traded Campers and Left Crossroads -2012.
*Purchased New 5er & Came back May-2016
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