RV News RVBusiness 2021 Top 10 RVs of the Year, plus 56 additional debuts and must-see units → ×
 



Reply
 
Thread Tools Search this Thread Display Modes
 
Old 02-02-2021, 10:13 AM   #1
Junior Member
 
Join Date: Sep 2010
Posts: 28
Default My fresh water tank was full, 40 gal??

I recently blew out my lines for the winter, drained the hot water htr., opened the hot & cold low point water lines. I also opened the fresh water drain. It must have been full, 40 gal. It took forever to drain. My Question is: I did not fill the tank, how did it get full? I have been towing the weight of 40 gallons of water for I don't know how long.
__________________

__________________
2014 Fun Finder X 210 UDS
2019 GMC Yukon
LEWR is offline   Reply With Quote
Old 02-03-2021, 08:52 AM   #2
Site Team
 
Join Date: Oct 2009
Location: Arizona
Posts: 1,217
Default

The only way I can think of that this could happen is that you were hooked to city water and the check valve failed. This would allow city water to backflow through the water pump and into the tank.
__________________

__________________
2011 Chevy Silverado Crew Cab 4X4
2009 210 WBS
Prodigy P3
LJAZ is offline   Reply With Quote
Old 02-04-2021, 09:00 AM   #3
Junior Member
 
Join Date: Sep 2010
Posts: 28
Default

Thanks, I will check that valve. Is it close to the 12 volt water pump?
__________________
2014 Fun Finder X 210 UDS
2019 GMC Yukon
LEWR is offline   Reply With Quote
Old 02-05-2021, 01:06 AM   #4
Senior Member
 
Join Date: Oct 2017
Location: SoCal
Posts: 248
Default

Quote:
Originally Posted by LEWR View Post
Thanks, I will check that valve. Is it close to the 12 volt water pump?
As I understand it the primary check valve is part on the hose connection port on the side of the trailer.
Mine has failed a couple of times and also the check valves which are integral to the diaphragm water pump opened and did not stop the reverse flow through the pump which was off. My tank overflowed a couple of times.

I added a check valve in series with the water pump and it has never backflowed into the fresh water tank again.
__________________
2016 F281BIKS
2003 F250 7.3L Powerstroke Crewcab longbed
JimboFunFinder is offline   Reply With Quote
Old 02-07-2021, 07:58 PM   #5
Member
 
Join Date: Jul 2017
Location: FL Keys and Vermont
Posts: 39
Default

If the check valve failed, wouldn't the tank overflow since nothing else would stop the incoming water?
__________________
Dick Harper
Florida Keys and far Northern Vermont
2009 Fun Finder XT245
2013 GMC Sierra
NorthPuffin is offline   Reply With Quote
Old 02-07-2021, 08:59 PM   #6
Senior Member
 
Join Date: Oct 2017
Location: SoCal
Posts: 248
Default

Quote:
Originally Posted by NorthPuffin View Post
If the check valve failed, wouldn't the tank overflow since nothing else would stop the incoming water?
Yes, but it takes time as they usually do not totally blow out. When I was along the Oregon Coast comes to mind. We were connected to water and it took a couple of days for the tank to start spilling out the hose fill entry. I usually keep some water in the tank just for emergencies, so it may have taken 48 hours to fill the 15-20 gallons of water to overflow the tank. That is a reasonably small leak. My additional check valve at the pump is just belt and suspenders.
And yes, I have a pressure regulator right at the hose connection to the trailer.
__________________
2016 F281BIKS
2003 F250 7.3L Powerstroke Crewcab longbed
JimboFunFinder is offline   Reply With Quote
Old 02-08-2021, 08:55 AM   #7
Site Team
 
Join Date: Oct 2009
Location: Arizona
Posts: 1,217
Default

Quote:
Originally Posted by LEWR View Post
Thanks, I will check that valve. Is it close to the 12 volt water pump?
On my trailer it was right next to the pump maybe a foot or so away. Although some pumps do have the check valve integrated into the pump.
__________________
2011 Chevy Silverado Crew Cab 4X4
2009 210 WBS
Prodigy P3
LJAZ is offline   Reply With Quote
Old 02-08-2021, 11:03 PM   #8
Senior Member
 
Join Date: Jan 2012
Location: South Dakota
Posts: 2,868
Default

Quote:
Originally Posted by LEWR View Post
I recently blew out my lines for the winter, drained the hot water htr., opened the hot & cold low point water lines. I also opened the fresh water drain. It must have been full, 40 gal. It took forever to drain. My Question is: I did not fill the tank, how did it get full? I have been towing the weight of 40 gallons of water for I don't know how long.
Recently ?? And posted above on 02/02/21? Where are you located?

Here - everyone winterized in the fall .. like September/October.

Yesterday morning it was 18 degrees below zero here.
__________________

__________________
2012 Fun Finder XT 276 Toy Hauler & Harley Davidson Ultra Classic with Condor wheel chock
2014 Dodge Ram 2500 AT 4X4 Crew Cab 6.4 L Hemi, 373 gears, tow package, Rambox option, Revolver X2 tonneau cover, Equal-I-zer anti-sway hitch.
Eagle 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 08:23 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
×