Thread Tools Display Modes
Old 07-16-2018, 06:40 PM   #1
Senior Member
OswegoLion's Avatar
Join Date: Apr 2014
Location: Port St. Lucie
Posts: 327
How do you completely empty the fresh water holding tank?

Not really sure!!

OswegoLion is offline   Reply With Quote
Old 07-16-2018, 06:45 PM   #2
Site Team
Flybob's Avatar
Join Date: Oct 2014
Posts: 10,300
It is difficult if not impossible to completely drain the FW tank as there is generally at least one low point that will hold some water. You can alternate the Ft-to-Bk level to help. This is why it is important to sanitize on a regular basis. My last two TT had rigid tanks that were placed to allow access to the top of the tank. In each I cut a 8" hole and added a water tight marine deck plate. This allowed me to use a W/D shop vac to completely dry the tank. Unfortunately in most larger units this is not possible.


2015 Freedom Express 248RBS
TV 2015 Silverado HD2500 Duramax
TST Tire Monitors
Honda 2000I + Companion
2 100W solar panels
Flybob is online now   Reply With Quote
Old 08-01-2018, 09:43 AM   #3
Senior Member
Join Date: Jan 2015
Location: Barrie, Ontario, Canada
Posts: 572
Most trailers have a fresh water tank drain valve or drain cock. It is usually mounted on an angle to the tank so you should be able to empty the tank. I have never had a problem with winterizing.

2009 F150 XLT crewcab 5.4L and 3.73
2010 Flagstaff 27 BHSS
tenttotrailer is offline   Reply With Quote
Old 08-01-2018, 10:17 AM   #4
Senior Member
NMWildcat's Avatar
Join Date: Jun 2012
Location: Southern NM
Posts: 4,790
The only RV that I could completely empy any tank on was one that had access to the bottom of the tanks and I could push up on the actual tank and reverse the sag.

We always leave a little water in all our waste tanks, but it would be nice to be able to actually drain the fresh completely by using the drain valve. But, evidently it is just not meant to be.

Before we retired, when we couldn't use the RV as often, I drained the fresh tank and ran the pump until no water came out. Then I raised and lowered sides/front of the RV to get more out and left the drain valve open. 5 months later while taking the 'dry' RV to a CG, water was still pouring out the fresh drain valve while going down the road

So now I just do as mentioned earlier and sanitize the fresh tank periodically.
Scott and Liz - Southern NM
2012 Wildcat Sterling 32RL - w/level up (best option ever)
2007 Chevy 2500HD 4dr short bed Duramax w/allison
Reese Fifth Airborne air ride king pin coupler with Sidewinder
NMWildcat is offline   Reply With Quote
Old 08-01-2018, 10:19 AM   #5
Senior Member
Join Date: Dec 2014
Location: indiana
Posts: 686
If you open the drain at the campground, the bouncing on the way home will shake most of the water out. I usually dump most of my water into the black tank at the site to aid in flushing the tank so there is not much left to drain.
Jim and Deb
Many times..asst grandkids
2015 Shamrock 23ikss
2013 Ram 1500
jking46 is offline   Reply With Quote
Old 08-01-2018, 04:26 PM   #6
Junior Member
Dmax07's Avatar
Join Date: Feb 2018
Location: Mississippi
Posts: 27
I found debris blocking the dump valve and used compressed air to blow into the tank from the dump valve to knock them loose. The tank drained after that.
Dmax07 is offline   Reply With Quote
Old 08-01-2018, 08:36 PM   #7
Join Date: Jul 2018
Posts: 86
Flip it upside down and tape its belly should get all of the water out.

I don't really worry about residual water in my tanks or lines because I'm fairly religious about sanitizing my system and adding additional bleach to my fresh water after sanitation to keep things safe.

I often drain my FW tank while driving. I remove the valve and water the road as I head back home. Its fresh and not waste water so I don't see much harm in this practice.

Ilovemywife is offline   Reply With Quote

fresh water, tank, water

Thread Tools
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

» Featured Campgrounds

Reviews provided by


This website is not affiliated with or endorsed by Forest River, Inc. or any of its affiliates. This is an independent, unofficial site.

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 06:10 PM.