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Black Tank Flush Line

Yahoo Message Number: 17051
Sorry to create confusion. On my coach (99) the black tank flush line goes through an anti-siphon valve before it goes into the top of the black tank. The valve is located behind the washer/dryer wall and between the floor panels.
When it failed, as I turned the water on to flush the tank, the defective valve sprayed water out the opening between the floor panels and onto the floor inside the coach.
To determine what was happening, I removed the entire panel that covers the water pump, waste tanks, water inlets, etc. You have to remove all the phillips head screws and cut the calking out the pry the dang thing out of the coach. That opens up the entire plumbing system. I determined that it was an easy fix to cut the plastic supply line and splice it.
When flushing the black tank, the line goes directly from the hose connection to the top of the tank.
I can only assume that the factory put the valve on for code compliance. I can't imagine what scenario would produce a back flush of the black water into the water system.
I learned by mistake during the first year of so of usage that you should not leave the black flush line unattended or it will fill the tank and toilet and overflow. I was standing in front of the coach one day just shooting the breeze with some fellow RV'ers while performing a flush task. My wife was walking past the toilet at the instant the water began spilling over the top.
Needless to say, I'll never do that again. I usually fill to half or so while paying close attention. (Yes, Dear)

Larry
Intrigue
10762

Re: Black Tank Flush Line

Reply #1 –
Yahoo Message Number: 17052
Larry

I have never used the black tank flush without opening the black tank valve. It has worked just fine, and I do not have to worry about any over flow into the coach.

I just can't imagine doing that without the black tank valve being open.

Tom Royer

2003 Allure #30858

Quote
I learned by mistake during the first year of so of usage that you
should not leave the black flush line unattended or it will fill the tank and toilet and overflow. I was standing in front of the coach one day just shooting the breeze with some fellow RV'ers while performing a flush task. My wife was walking past the toilet at the instant the water began spilling over the top.

Quote
>

Needless to say, I'll never do that again. I usually fill to half or
so while paying close attention. (Yes, Dear)

Re: Black Tank Flush Line

Reply #2 –
Yahoo Message Number: 17056
You should leave the dump valve opened when flushing out the black tank.
GBettig 2002 Intrigue 11451

Black tank flush line

Reply #3 –
Yahoo Message Number: 17277
Glen. I have a 99 Intrigue, so they are probably the same. I found that my system has (had) an anti-siphon valve between the hose connection on the outside and the inlet on the top of the black tank.
When I hooked up the hose to flush the black tank, I got water everywhere from the anti-siphon valve.
To remedy the bugger, I had to remove the entire fiberglass access panel that covers the water inlets, etc. and it was easy to see the source of the leak.
I decided to bi-pass the valve entirely since I can conceive of a scenario where the black water would siphon back into the water system. The line now goes directly into the tank.
You may have a clogged valve. If you decide to remove the panel, you have complete access to the system.

Good luck.

Larry

Intrigue 10762
 

Re: Black tank flush line

Reply #4 –
Yahoo Message Number: 17282
Thanks so much for the tip - not a big problem but if it's there, it should work. Now if I could just figure out how to make the coach "more horney". 1 air horn works - the 2nd is mute.

Glen

'98 Intrigue
#10616