I use the blank tank flush about every other dump partly to put 5+ gallons water in the tank so it sloshes around when driving. Couple days ago it would not put any water in the tank so I put 100 psi of air on the hose and still nothing.:(Fortunately my grey and black tanks are on the same level and unfortunately the same size (what were they thinking) but this lets me transfer grey water to the black when the grey gets full. By leaving the cap on and opening both valves until I can no longer hear water moving I can shift 20+ gallons of grey to the black. So, yesterday after dumping only the black I put the cap on and opened both valves putting 20 gallons of grey in the black. Drove 100+ miles on curvy back roads and when I hooked up at the next CG... SUCCESS, the black flush works again.:B Maybe this will work for you if you have this problem.

Careful there with that air pressure. 100 psi on water lines can cause burst pipes. The plumbing in my TT is rated only 80 psi. Yours is evidently stronger, but still . . . .

Mine got plugged also and I ran an electrical snake through it to clear it out. An electrical snake is smaller than a plumbing snake which is used to clean out drains.

ON my coach when that happened I opened the hidden door to the black tank compartment and removed the tank flush wand from the top of the tank (three screws). The spray holes had plugged up with toilet paper so no water could pass. I used a drill bit to clean and enlarge the holes just a little more then cleaned everything up and re assembled. I have had to do this twice now in the last 7 or eight years.

naturist wrote:Careful there with that air pressure. 100 psi on water lines can cause burst pipes. The plumbing in my TT is rated only 80 psi. Yours is evidently stronger, but still . . . .He is not putting any pressure on the RV's water lines, I am pretty sure. There should be a dedicated line that runs to the black tank flush.

rgatijnet1 wrote:Mine got plugged also and I ran an electrical snake through it to clear it out. An electrical snake is smaller than a plumbing snake which is used to clean out drains. Thanks for the info! I wasn't aware of that!

Black tank flush stopped working | Good Sam Community

ljr869
Explorer
Oct 09, 2016
I don't think my black tank has ever been full enough to contact the tank flush unit. That's one way of avoiding clogged holes.
DSDP_Don
Explorer
Oct 09, 2016
The plugging up of the flusher is a Monaco issue. It's caused, as noted above, by black tank debris getting into the sprayer head and then drying up. You don't need to remove the sprayer. Just remove the hose, use an 1/8" drill and drill down into the sprayer several times. The sprayer function is of little value. What you want is a large amount of water going thru the flusher at the end of the tank, which will rinse the debris down toward the drain.
DavidPisani
Explorer
Oct 08, 2016
I used the plumbing snake and it also worked out. A plumber's auger, also called a snake, can be a handy piece of equipment when it comes time to unclog any drain, even a sewer line. Problems with faucets and sinks can be extremely annoying. The drain requires a little extra care because it may need more than a liquid to pour down there. You could be dealing with a major clog that requires a snake tool that will pull it all out. There are plenty of products available on the market that claim they can clear a bathroom drain, but too often those claims aren't backed up by the actual product. A professional plumber sewer line replacement Gloucester county NJ can attack that bathtub drain with a snake and clear a clog all the way to the source.
randallb
Explorer
Oct 06, 2016
This is pretty normal. On my purchased new 2008 HR the black tank flusher would not flow any water. Monaco in Coburg pulled it out under warranty and enlarged the holes. It took next to nothing to plug the washer head. The delivery driver who drove our coach to the dealership must have used the toilet and the excrement and paper had clogged the head. Once it dries on the head it turns to concrete.
Ivylog
Explorer III
Oct 05, 2016
Nasty stuff??? My valves are very close together and the cap I use has a 3/4" hose connection that I put a hose valve on. When I get to where I can dump I hold the sewer hose under the valve and drain the two quarts of stuff into the sewer hose and then take the cap off and hook the sewer hose up... No mess.
Old-Biscuit
Explorer III
Oct 05, 2016
rgatijnet1 wrote:
Old-Biscuit wrote:
rgatijnet1 wrote:
Mine got plugged also and I ran an electrical snake through it to clear it out. An electrical snake is smaller than a plumbing snake which is used to clean out drains.

How do you get the wire thru the 'anti-siphon vacuum breaker device' ??

As for Pressure..........PEX Tubing
Long-term Pressure Ratings:
*160 psi @ 73.4°F
*100 psi @ 180°F
*80 psi @ 200°F

I just ran the wire in through the connection where the exterior hose connects. Don't know what is in there but the wire cleared the obstruction the only time I have had to do it.

Couldn't have pushed wire too far.......
RV MFGs. are required to install an Anti-siphon vacuum breaker.
They usually are inside bathroom sink cabinet..seen them in closets too.
TNGW1500SE
Explorer
Oct 05, 2016
Ivylog wrote:
...........Fortunately my grey and black tanks are on the same level ........ this lets me transfer grey water to the black when the grey gets full. By leaving the cap on and opening both valves until I can no longer hear water moving I can shift 20+ gallons of grey to the black. ........

Don't you get some nasty water coming out when you take the cap off to hook up the hose?

I do the same thing but with the hose attached. I just lift the hose above the level of the tank. I wish I had room for a third valve.
STBRetired
Explorer
Oct 05, 2016
Should have Anti-siphon valve and a backflow preventer in the line. After 16 years, something went wrong with my backflow preventer where it would require 60 PSI to open the valve in the correct direction. So some campgrounds would no have sufficient pressure to use the tank flusher. Replaced the backflow preventer and all is well now.
rgatijnet1
Explorer III
Oct 04, 2016
Old-Biscuit wrote:
rgatijnet1 wrote:
Mine got plugged also and I ran an electrical snake through it to clear it out. An electrical snake is smaller than a plumbing snake which is used to clean out drains.

How do you get the wire thru the 'anti-siphon vacuum breaker device' ??

As for Pressure..........PEX Tubing
Long-term Pressure Ratings:
*160 psi @ 73.4°F
*100 psi @ 180°F
*80 psi @ 200°F

I just ran the wire in through the connection where the exterior hose connects. Don't know what is in there but the wire cleared the obstruction the only time I have had to do it.
Old-Biscuit
Explorer III
Oct 04, 2016
rgatijnet1 wrote:
Mine got plugged also and I ran an electrical snake through it to clear it out. An electrical snake is smaller than a plumbing snake which is used to clean out drains.

How do you get the wire thru the 'anti-siphon vacuum breaker device' ??

As for Pressure..........PEX Tubing
Long-term Pressure Ratings:
*160 psi @ 73.4°F
*100 psi @ 180°F
*80 psi @ 200°F