Reply
 
Thread Tools Search this Thread Display Modes
 
Old 05-13-2019, 09:06 PM   #1
Member
 
Join Date: Oct 2017
Location: SoCal
Posts: 45
Default How to actually flush out the black water drain line

Hi!
I have a 2016 F281BIKS that came with three holding tanks. The rear most is the black water, the next is the grey for the shower and the front most tank (still behind the wheels) is for the kitchen sink. The black gate valve is under the belly cover near the rear tank and the 3" pipe then runs exposed toward the wheels under the frame. The two grey water tanks have separate gate valves (1 1/2 inch?) and are wyed together to dump into the 3" drain line below the two grey tanks. The sewage connection is even further toward the wheels (in the direction of the front of the trailer). This means that the grey water never flushes out the entire 3" line since the grey water is 'down stream' from the black gate valve. We have never had a trailer before where the grey water did not flush out the black yuck remaining in the 3" pipe. Is there any reasonable way to plumb some water into the rearmost part of the 3" line so that I can better flush it out?
I realize now that I am writing this that I should have added a photo which I will try to add later.
Thanks for any suggestions!
__________________

__________________
2016 F281BIKS
2003 F250 7.3L Powerstroke Crewcab longbed
JimboFunFinder is offline   Reply With Quote
Old 05-13-2019, 09:43 PM   #2
Senior Member
 
Join Date: Feb 2012
Location: Southern California
Posts: 1,461
Default

Your trailer should have a black tank flush fixture -- does it? If so, run fresh water into that fitting. First, dump the black water, of course. Then flush the black tank thoroughly. Run fresh water for a minute with the black valve closed, and then open the valve. Do this about three times. Then turn off the water. (You should be using a special hose for this, by the way -- don't use your good hose!)

Now that the black tank is clean as a whistle, open the gray tank valves.

If you want to be extra careful, run some water in the sink with the gray valves closed and then open the valves to really flush the lines.

I hope this is helpful and not too obvious! Sorry if I am telling you stuff you already know.
__________________

profdant139 is offline   Reply With Quote
Old 05-14-2019, 11:21 AM   #3
Member
 
Join Date: Oct 2017
Location: SoCal
Posts: 45
Default

Thanks for the quick response! Yes, my FunFinder has a clean out nozzle on the black water tank but it seems that most of the campgrounds we go to do not have a hose with a threaded end. Most are just a cut hose for rinsing off the concrete or squirting in the flexible sewer hose from the trailer. I have attached two photos I hope so you can see my issue.
Don't worry about insulting my knowledge as I can always stand to learn again.
Attached Thumbnails
20190514_082535.jpg   20190514_082619.jpg  
__________________
2016 F281BIKS
2003 F250 7.3L Powerstroke Crewcab longbed
JimboFunFinder is offline   Reply With Quote
Old 05-14-2019, 11:33 AM   #4
Senior Member
 
Join Date: Feb 2012
Location: Southern California
Posts: 1,461
Default

Aha! If there is no threaded connection available, use a Water Thief!

https://en.wikipedia.org/wiki/Water_thief

But don't do this in the campground -- do it at the dump station. Use your water thief to hook up your rinse hose to the NON potable water supply. There is often a potable supply in the same general area. Don't put the rinse hose on that one!

Also, note that a water thief often leaks a little -- the pressure of the water going in can sometimes squirt out the inflow end of the hose. No big deal, but try not to get wet. Turn on the non potable supply slowly. Don't ask me how I know this.

Hope this helps.
profdant139 is offline   Reply With Quote
Old 05-14-2019, 11:46 AM   #5
Member
 
Join Date: Oct 2017
Location: SoCal
Posts: 45
Default

Thanks for the info on the Water Thief! I will not ask how you know!
I will need to get one but this is not my current problem. It is that the hoses at the dump stations connected to the nonpotable water do not have a thread at the end. The end is just a hose which has been cut.
__________________
2016 F281BIKS
2003 F250 7.3L Powerstroke Crewcab longbed
JimboFunFinder is offline   Reply With Quote
Old 05-14-2019, 12:12 PM   #6
Senior Member
 
Join Date: Feb 2012
Location: Southern California
Posts: 1,461
Default

Exactly! So you take the unthreaded end of the water thief. You jam it onto the cut end of the rinse hose. The other end of the water thief is threaded. You attach your threaded rinse hose to that end. And then you attach the outflow part of your hose to the rinse port on the side of the trailer.

Here is a one-minute video someone posted:

profdant139 is offline   Reply With Quote
Old 05-14-2019, 12:15 PM   #7
Senior Member
 
Join Date: Feb 2012
Location: Southern California
Posts: 1,461
Default

You know, I suppose you could also carry a small hose clamp -- just to make sure there is no backflow spillage at the unthreaded connection. Jam the water thief/water bandit onto the cut hose. Slip the hose clamp over the joint between the hose and the water bandit. Tighten your hose clamp with your handy screwdriver.

Might not be necessary, but I just might put a hose clamp into my toolbox for exactly this purpose!
profdant139 is offline   Reply With Quote
Old 05-14-2019, 12:18 PM   #8
Senior Member
 
Join Date: Feb 2012
Location: Southern California
Posts: 1,461
Default

One more thought -- we have often used our water thief to fill our fresh water tank from campground faucets that lacked a threaded connection. And then we use the same water thief to, once in a while, to deal with the dreaded "cut hose" issue at the dump station.

I then have to wash the water thief very carefully, before using it again for fresh water.

But a light slowly dawns -- I could carry two of these little guys!! They are cheap and small. I am pretty sure that most Walmarts carry them in the RV aisle.
profdant139 is offline   Reply With Quote
Old 05-15-2019, 04:41 PM   #9
Member
 
Join Date: Oct 2017
Location: SoCal
Posts: 45
Default

Thanks! How might I improvise to get water into the tank flush system when I cannot connect to a hose?\

For example, could I somehow have a hose that would connect between the outside spray port and the tank flush connection? Then I could turn on my water pump and get water into the holding tank.
__________________
2016 F281BIKS
2003 F250 7.3L Powerstroke Crewcab longbed
JimboFunFinder is offline   Reply With Quote
Old 05-15-2019, 05:41 PM   #10
Senior Member
 
Join Date: Feb 2012
Location: Southern California
Posts: 1,461
Default

OK -- so now let's assume you are at a dump station that has no water at all. That is rare, but it does happen.

In that case, first dump your black tank. Close the valve. Use the toilet flush lever to put water into the black tank. Dump the tank again.

Then dump the gray tank and close the gray valve. Run water in your sink to put water into the gray tank. Dump the gray tank again.
__________________

profdant139 is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Powered by vBadvanced CMPS v3.2.3
Disclaimer:

This website is not affiliated with or endorsed by Fun Finder RV, Cruiser RV, or any of its affiliates. This is an independent, unofficial site.


All times are GMT -6. The time now is 05:49 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.