General Boards > Technical Support
BLACK TANK FLUSHER
George Harwell:
Black tank flush has almost no flow. I suspect the anti-siphon valve or some kind of restriction in the line. The anti-siphon valve is on the wall behind the washer so will require removing it to get the valve removed. Just wondering if anyone has experienced difficulties with this valve before I jump in with both feet.THANKS!
Richard And Babs Ames:
On ours the hose from the bay mounting point to the tank was too long and settled into a kink in the hose that restricted the flow. It has settled into the kink over time but was a very easy fix.
Bill Schneider:
I had this same problem and it was the flushing nozzle in the black tank. I removed it from the tank and cleaned it and that's all it took. I believe the nozzle became clogged over time by my not using the flushing system everytime I emptied the tank. I now take the time to rinse the tank everytime and the problem has not returned. Be sure to clean the old sealant off the tank before applying new sealant when you reinstall the nozzle. You do not want a leak!
Joel Ashley:
George,
We had similar symptoms when our rig was a few months old. Finally one day I parked next to the infrequently used dump at the Bend Service Center and waited the hour it took to drain the tank. I flushed it a bit with the built-in rinser and waited for that to drain. Then I used long sleeved rubber gloves and reached up beyond the black's valve with a coathanger I'd bent a little crook into. Poking around and pulling, it wasn't long before I disgorged a 3 inch diameter piece of black plastic.
Turns out this is very common. When they install the waste tanks and cut out the hole for the valve fittings, the cut-out often flops inside the tank and is not removed because the guys don't have time to dig it out. It may not be an immediate problem for the new owner, but eventually that little disk will work its way back to in front of the outlet, with each flush of the tank. Then it flips up and can jam in the opening rather than float cleanly out.
Try the coathanger, George. If your last tank emptying procedure was slow-going, and you have the same problem I describe, then that little disk is right there at the valve cutout and can be easily fenagled out. I fully thought I was going to find some kid had stuck a towel down the john while the coach was showroomed, so was surprised when my coathanger drug out that disk within 20 seconds. ;)
Tom Rogers:
--- Quote from: Joel Ashley ---George,
We had similar symptoms when our rig was a few months old. Finally one day I parked next to the infrequently used dump at the Bend Service Center and waited the hour it took to drain the tank. I flushed it a bit with the built-in rinser and waited for that to drain. Then I used long sleeved rubber gloves and reached up beyond the black's valve with a coathanger I'd bent a little crook into. Poking around and pulling, it wasn't long before I disgorged a 3 inch diameter piece of black plastic.
Turns out this is very common. When they install the waste tanks and cut out the hole for the valve fittings, the cut-out often flops inside the tank and is not removed because the guys don't have time to dig it out. It may not be an immediate problem for the new owner, but eventually that little disk will work its way back to in front of the outlet, with each flush of the tank. Then it flips up and can jam in the opening rather than float cleanly out.
Try the coathanger, George. If your last tank emptying procedure was slow-going, and you have the same problem I describe, then that little disk is right there at the valve cutout and can be easily fenagled out. I fully thought I was going to find some kid had stuck a towel down the john while the coach was showroomed, so was surprised when my coathanger drug out that disk within 20 seconds. ;)
--- End quote ---
Is the OP talking about the flush valve or the dump valve ?? i think the flush valve???
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