Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
 

Go Back   Thor Forums > Thor Tech Forums > Maintenance and Repair
Click Here to Login
Reply
 
Thread Tools Display Modes
 
Old 04-19-2020, 12:12 PM   #1
Member
 
Brand: Thor Motor Coach
Model: ACE 30.4
State: Texas
Posts: 49
THOR #11223
Fresh Water Tank Overflow

I have a 2018 Thor ACE 30.4.

This happens occasionally when my fresh water tank is filled half way. So, Iím hooked up at a RV site and the next morning I noticed my fresh water tank is full and overflowing.

What is causing this happen? Is it an easy fix? Is there a video to help with the repair? Iím not very experienced on RV repairs. Or is it best to have an experience RV mechanic you repair it?

Thank you for your help!

Danny

__________________
droark55 is offline   Reply With Quote
Old 04-19-2020, 01:00 PM   #2
Senior Member
 
OldWEB's Avatar
 
Brand: Thor Motor Coach
Model: 2011 FW Hurricane 33T
State: England
Posts: 953
THOR #16471
Check valve problem

Typically the problem is a check valve, with all the different setups, here are a few suggestions on where to look. Good luck
__________________
OldWEB is offline   Reply With Quote
Old 04-19-2020, 01:37 PM   #3
Senior Member
 
paulwadley's Avatar
 
Brand: Thor Motor Coach
Model: Miramar 37.1
State: California
Posts: 1,976
THOR #12698
A typical issue with the Anderson water valve. That is the valve you set to fill your tank or run the city water line into your rig. The valve has multiple rubber "O" rings that sometimes get twisted or torn which allows city water to flow through your system and into your fresh water tank at the same time. You can buy a new Anderson valve and replace it if needed for around $35.00. It is an easy fix. Make sure you do not turn on the city water to your hose until after you have selected where you want the water to go (Tank or rig water lines). That is sometimes an issue if it is pressured at the time you try moving the water valve that causes the rubber o rings to tear.
__________________
paulwadley is offline   Reply With Quote
Old 04-19-2020, 01:42 PM   #4
Senior Member
 
bevedfelker's Avatar
 
Brand: Thor Motor Coach
Model: 2015 Vegas 24.1
State: Pennsylvania
Posts: 1,439
THOR #2601
Had this happen several times in my 2015 Vegas. Don't know which water pump you have, but in my case it's the check valve that is internal to the pump. It's a simple thing to remediate (not interested in spending money on a new pump if I can correct the problem easily).

For what ever reason (probably city water pressure) the water pressure is forcing the check valve in the pump to open slightly allowing water to flow from city water lines, through the pump, and then back filling the fresh water tank.

What I do is turn off the city water and run the pump for about a minute using the faucet in the kitchen sink. Turn the water off, turn the pump off, and then reopen the city water. I then use the low point drain to drain the water from the fresh water tank.

This isn't a permanent fix, but I've only had the tank fill and overflow 3 times in the past 5 years of using the RV.
__________________
Ed & Bev Felker
Retired USAF Col and retired Nurse
Traveling with Lily & Bella ('Teddy Bear' breed)
2015 Vegas 24.1 (E-350)
bevedfelker is offline   Reply With Quote
Old 04-20-2020, 07:45 AM   #5
Senior Member
 
Brand: Keystone
Model: Sprinter
State: Florida
Posts: 1,422
THOR #15553
Quote:
Originally Posted by bevedfelker View Post
Had this happen several times in my 2015 Vegas. Don't know which water pump you have, but in my case it's the check valve that is internal to the pump. It's a simple thing to remediate (not interested in spending money on a new pump if I can correct the problem easily).

For what ever reason (probably city water pressure) the water pressure is forcing the check valve in the pump to open slightly allowing water to flow from city water lines, through the pump, and then back filling the fresh water tank.

What I do is turn off the city water and run the pump for about a minute using the faucet in the kitchen sink. Turn the water off, turn the pump off, and then reopen the city water. I then use the low point drain to drain the water from the fresh water tank.

This isn't a permanent fix, but I've only had the tank fill and overflow 3 times in the past 5 years of using the RV.
Low point drain will not drain the FW tank. The FW tank has it's own drain. Low point drains drain the piping system hence the name. They are are 1 hot and 1 cold.
__________________
2011 Keystone Sprinter 323BHS. Retired Master Electrician. All Motor Homes are RV's. All RV's are not Motor Homes.
cavie is offline   Reply With Quote
Old 04-20-2020, 09:39 PM   #6
Senior Member
 
Yvonnemarc's Avatar
 
Brand: Thor Motor Coach
Model: ACE 30.2
State: Massachusetts
Posts: 441
THOR #8180
Just so you know the ACE 30.4 doesnít have an Anderson valve. So eliminate that quick. Itís a bad check valve on the pump. There is an isolation valve between the FW tank and the pump. Close it and the city water wonít back feed into the FW tank. I know that doesnít solve the check valve issue but your tank wonít fill up and overflow. Check valves in pumps this small arenít usually external so youíll need to get a new pump.
Click image for larger version

Name:	Adjustments.jpg
Views:	135
Size:	72.0 KB
ID:	23396
__________________
USN - RETIRED NUKE
Taunton, MA
Yvonnemarc is offline   Reply With Quote
Old 04-21-2020, 01:10 AM   #7
Senior Member
 
Brand: Thor Motor Coach
Model: Hurricane 29M
State: Texas
Posts: 1,980
THOR #11781
Same things has happened a couple of times in my Hurricane. My fix is turn off the city water. Use the FW tank for a while, Then switch back to city water. I figure the check valve in my pump gets some 'junk' that keeps it open a tad allowing water to flow back to the tank. It hasn't happened lately, but I added cleaning the 'filter' by the pump to my routine maintenance list.
__________________
Lt Keefer
2018 Hurricane 29M
CHF, Saf-T-Plus, SumoSprings
Lt Keefer is offline   Reply With Quote
Old 04-21-2020, 01:37 AM   #8
Senior Member
 
Brand: Keystone
Model: Sprinter
State: Florida
Posts: 1,422
THOR #15553
Quote:
Originally Posted by Yvonnemarc View Post
Just so you know the ACE 30.4 doesn’t have an Anderson valve. So eliminate that quick. It’s a bad check valve on the pump. There is an isolation valve between the FW tank and the pump. Close it and the city water won’t back feed into the FW tank. I know that doesn’t solve the check valve issue but your tank won’t fill up and overflow. Check valves in pumps this small aren’t usually external so you’ll need to get a new pump.
Attachment 23396
Water pumps are very much rebuild able and easy to do.

When on city water turn the pump off.
__________________
2011 Keystone Sprinter 323BHS. Retired Master Electrician. All Motor Homes are RV's. All RV's are not Motor Homes.
cavie is offline   Reply With Quote
Old 04-21-2020, 01:12 PM   #9
Member
 
Brand: Thor Motor Coach
Model: ACE 30.4
State: Texas
Posts: 49
THOR #11223
I want to thank everyone for your quick response and suggestions.

Do I follow the city water intake line to find the water pump?


Quote:
Originally Posted by droark55 View Post
I have a 2018 Thor ACE 30.4.

This happens occasionally when my fresh water tank is filled half way. So, Iím hooked up at a RV site and the next morning I noticed my fresh water tank is full and overflowing.

What is causing this happen? Is it an easy fix? Is there a video to help with the repair? Iím not very experienced on RV repairs. Or is it best to have an experience RV mechanic you repair it?

Thank you for your help!

Danny
__________________
droark55 is offline   Reply With Quote
Old 04-21-2020, 02:50 PM   #10
Senior Member
 
Brand: Keystone
Model: Sprinter
State: Florida
Posts: 1,422
THOR #15553
Quote:
Originally Posted by droark55 View Post
I want to thank everyone for your quick response and suggestions.

Do I follow the city water intake line to find the water pump?
No. You turn the pump on. Open a faucet. Walk around and listen for the pump.
Take a #2 square driver with you to remove a panel hiding the pump. Look under bed, drawers etc.
__________________
2011 Keystone Sprinter 323BHS. Retired Master Electrician. All Motor Homes are RV's. All RV's are not Motor Homes.
cavie is offline   Reply With Quote
Old 04-21-2020, 04:18 PM   #11
Senior Member
 
Brand: Thor Motor Coach
Model: Citation
State: Texas
Posts: 905
THOR #8139
We've had this happen 2 or 3 times in the past couple of decades.
Always try the easy fix first.

Turn the campground water off.
If your pump is on turn it off.
If it's off, turn it on then off, a couple of times.
Turn the city water back on, check the overflow.

So far with this method we've never had to replace the check valve.
__________________
abjbrtd is offline   Reply With Quote
Old 04-21-2020, 08:56 PM   #12
Senior Member
 
Yvonnemarc's Avatar
 
Brand: Thor Motor Coach
Model: ACE 30.2
State: Massachusetts
Posts: 441
THOR #8180
Quote:
Originally Posted by cavie View Post
Water pumps are very much rebuild able and easy to do.

When on city water turn the pump off.


Very easy but not if youíre a noob. Theyíre throw-aways.
__________________
USN - RETIRED NUKE
Taunton, MA
Yvonnemarc is offline   Reply With Quote
Old 04-21-2020, 09:58 PM   #13
Senior Member
 
Brand: Keystone
Model: Sprinter
State: Florida
Posts: 1,422
THOR #15553
Quote:
Originally Posted by Yvonnemarc View Post
Very easy but not if youíre a noob. Theyíre throw-aways.
go to Youtube, Watch a few videos and you won't be a noob very long.
__________________
2011 Keystone Sprinter 323BHS. Retired Master Electrician. All Motor Homes are RV's. All RV's are not Motor Homes.
cavie is offline   Reply With Quote
Reply

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

Disclaimer:

This website is not affiliated with or endorsed by Thor Industries or any of its affiliates. This is an independent, unofficial site.




All times are GMT. The time now is 04:27 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2022, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0 PL2