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Old 05-13-2018, 10:15 AM   #1
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Using tank flush hose connection

I have a 2017 2800qs sunseeker. Next to the electrical connection on the left side of the rv , there is a water hose connection with the following warning label:

Caution
Do not use the tank flush valves unless the full way termination valve is in the open position.

May result in an unsanitary conditions leading to illness or personal injury.

What tank flush valves and where are they located?
Is this used to flush the fresh water tank, the black tank ,the grey tank or all three tanks?

Also what is and where is this full way termination valve the label mentions?

Can anyone tell me how often should this system be used and why?

Thanks
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Old 05-13-2018, 10:33 AM   #2
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That "Fullway Termination Valve" gets us every time. Basicaly that's your black tank dump valve. Bottom line is, the black tank dump valve must be open when the tank flush is being done.
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Old 05-13-2018, 10:39 AM   #3
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I do not have your model hopefully someone cane come along with more info.

The flush that I am familiar with is for the black tank only. They are probably talking about a back flow preventer so sewage does not go into the water hose. I have always used a back flow preventer and a separate host just to flush the black tank. The tank drain valve must also be open.
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Old 05-13-2018, 10:54 AM   #4
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Quote:
Originally Posted by Oaklevel View Post
I do not have your model hopefully someone cane come along with more info.

The flush that I am familiar with is for the black tank only. They are probably talking about a back flow preventer so sewage does not go into the water hose. I have always used a back flow preventer and a separate host just to flush the black tank. The tank drain valve must also be open.
The label refers to the black tank drain (free flow to the sewer connection) valve. If you have a factory installed black tank cleanout system your external backflow preventer is a superfluous item (one already installed) and really shouldn't be used with a factory installed cleanout system.
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Old 05-13-2018, 11:53 AM   #5
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Quote:
Originally Posted by Tom C 47 View Post

Caution
Do not use the tank flush valves unless the full way termination valve is in the open position.

May result in an unsanitary conditions leading to illness or personal inju

Can anyone tell me how often should this system be used and why?

Thanks
A simple explanation is .... what you are looking at is a blackwater tank flush. You should connect a non drinking water hose to it and make certain the blackwater tank dump valve is open and connected to the sewer dump. When you put water into that tank flush, it washes out your blackwater tank and flushes 'stuff' out of the tank. If you have a clear rv sewer connection on your sewer hose, you'll see the 'stuff' come out.

We use it every time we dump if the connections are available and we're not at a dump station.
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Old 05-13-2018, 12:39 PM   #6
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Simple, Forest River wants you to have the black tank dump valve open when you flush the black water tank. Because if you don't and overfill the tank and have a brown mess coming out of the vent stack down on your head so that they can say, if you are trying to lay blame on them,: "We warned you not to use the black tank flush system with the dump valve closed"

However this is what I do and don't do as I say . I fill up the black tank after the initial dump at least 3/4 full with water, using the black tank flush system, and then pull the handle, repeat once or twice and done - tank is clean.
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Old 05-13-2018, 01:00 PM   #7
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Originally Posted by Cypressloser View Post
Simple, Forest River wants you to have the black tank dump valve open when you flush the black water tank. Because if you don't and overfill the tank and have a brown mess coming out of the vent stack down on your head so that they can say, if you are trying to lay blame on them,: "We warned you not to use the black tank flush system with the dump valve closed"
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Old 05-13-2018, 01:06 PM   #8
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I do the same as Cypressloser. If using with black tank valve closed, just don't walk away and try to do other things. Watch your tank monitor, if working. Don't fill black tank over 3/4. I have done it this way for 19 years. But safer if black water valve left open while flushing.
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Old 05-13-2018, 02:40 PM   #9
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I took it one step farther..went to Lowe’s and picked up a brass in-line garden hose fitting with a 90 degree valve in it. Male end into flushing port, hose in female end. Close valve, close black water dump valve, turn water on for flush hose (only used for flushing!). Since my Sunseeker had the flush on the opposite side of the rig, I used that fitting valve to run water in for a couple minutes, shut it off then go around to the other side and open the black valve to drain. Cycle this way a couple times and your tank should be pretty clean...I also keep a spray bottle with my hoses filled with a water/Clorox mix and spritz all the hose ends, couplings, and park water spigots as well as the flush hose connections. Save yourself some effort and get a Y connector for the park water source so you can hook two hoses at once....one white for potable and the other for flushing hose...
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Old 05-13-2018, 02:46 PM   #10
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Hi Tom C 47,
In addition to what all the folks said who have a 2800/2801 or stayed at a HI Express last night, you should know that you only have 1 vent on the roof. That is because your holding tanks are vented together with your sinks and shower*. If you pump water into your black tank via the flush system with the dump valve closed you MAY be able to force sewage into the rest of your plumbing via the vent without realizing it. That can’t be a good thing.
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