Reply
 
Thread Tools Display Modes
Old 03-28-2017, 09:02 PM   #1
Junior Member
 
jubbabnr's Avatar
 
Join Date: Apr 2015
Posts: 13
Water disappearing from F.W. tank?

Prior to a trip, I filled the freshwater tank to 2/3 full (according to panel gauge). Only use was a few bathroom trips on our five hour trip. After 5 nights connected to campground water, tank was near empty and would barely pressure up. After adding water, everything worked fine. Grey and black tanks filled normally. There are no visible leaks. Our 2015 Coachman Encounter 36BH has a separate f.w. tank fill hose connection from the city water hose connector.

Question is, could there be some type of siphoning from the f.w. tank going on while running city water?
__________________

jubbabnr is offline   Reply With Quote
Old 03-28-2017, 09:21 PM   #2
Senior Member
 
flymhi's Avatar
 
Join Date: Oct 2012
Location: Mile Hi City
Posts: 613
Was there additional water in your grey or black tank after the 5 days? If you don't notice a leak under the camper, I would suspect a slow drain from the toilet...?
__________________

__________________
2015 Denali Duramax 2500
2017 Coachmen 229TBS
2010 Shamrock 21SS - sold!
flymhi is offline   Reply With Quote
Old 03-28-2017, 09:32 PM   #3
Junior Member
 
jubbabnr's Avatar
 
Join Date: Apr 2015
Posts: 13
Several showers, dishes and 4 adults using bathroom...only dumped once prior to dumping before leaving.

Pump was off the entire time we were connected to city water.
jubbabnr is offline   Reply With Quote
Old 03-28-2017, 09:56 PM   #4
Member
 
Twice's Avatar
 
Join Date: Mar 2015
Location: CA Central Coast
Posts: 91
Smile

Quote:
Originally Posted by jubbabnr View Post
Prior to a trip, I filled the freshwater tank to 2/3 full (according to panel gauge). Only use was a few bathroom trips on our five hour trip. After 5 nights connected to campground water, tank was near empty and would barely pressure up. After adding water, everything worked fine. Grey and black tanks filled normally. There are no visible leaks. Our 2015 Coachman Encounter 36BH has a separate f.w. tank fill hose connection from the city water hose connector.

Question is, could there be some type of siphoning from the f.w. tank going on while running city water?
Last summer we were going to Boondock, we filled the tank to the max (50 gallons according to the manufacturer), we drove about 15 miles. We were very frugal with water yet were running low after a few days. I think the water was sloshing out of the overflow/drain as we drove. Before we went to Boondock in Quartzsite in January I capped both overflow/drain lines after we filled fresh water, then drove to our site and uncapped. We lasted over a week and still had half a tank of fresh water. Hope this helps you some....
__________________
Tammy and Tracey
and our doggie Jaq
2015 Ram 2500 Mega Cab w/ Cummins 4X4
2015 Coachmen Chaparral 336 TSIK

Twice is offline   Reply With Quote
Old 03-28-2017, 10:41 PM   #5
Junior Member
 
jubbabnr's Avatar
 
Join Date: Apr 2015
Posts: 13
Good call, I didn't check the f.w. tank gauge when we arrived.
Hard to imagine sloshing that much out but I guess it could. I'll ad cap and see.
Thank You
jubbabnr is offline   Reply With Quote
Old 03-28-2017, 10:47 PM   #6
Senior Member
 
fast murray's Avatar
 
Join Date: Jul 2011
Location: SD
Posts: 440
I ran in to the same thing with the Sierra we bought. Our Wildcat had a ball valve installed on the vent tube of the water tank. When filling the tank I would fill until water came out that line and close it. I could get probably 4 to 5 more gallons in until it came out of the vent by the fill hole. I'm thinking the Sierra is siphoning water out of the vent tube because it hold way more water than the wildcat yet we ran out way faster. I'll be putting a valve on it before the 1st outing.
__________________
2004 Wildcat 28BH
2012 Ram 2500 CCSB 6.7CTD
fast murray is offline   Reply With Quote
Old 03-29-2017, 09:20 AM   #7
Senior Member
 
Join Date: Mar 2017
Posts: 281
Quote:
Originally Posted by jubbabnr View Post
Several showers, dishes and 4 adults using bathroom...only dumped once prior to dumping before leaving.

Pump was off the entire time we were connected to city water.


Does the pump need to be on when connected to city water?
mj0528 is offline   Reply With Quote
Old 03-29-2017, 09:23 AM   #8
Senior Member
 
Join Date: Mar 2017
Posts: 281
Never mind, Judy answered my question. Hope I didn't screw up the pump
mj0528 is offline   Reply With Quote
Old 03-29-2017, 09:38 AM   #9
Site Team
 
Flybob's Avatar
 
Join Date: Oct 2014
Posts: 11,151
You won't hurt the pump if it is on when using city water., but you can cause the back flow valve to seat improperly and allow city water to fill the FW tank. You do not need the water pump on when on city water. If city water pressure is too low then use it to fill FW tank shut it off and use water pump to supply water from FW tank..
__________________

2015 Freedom Express 248RBS
TV 2015 Silverado HD2500 Duramax
TST Tire Monitors
Honda 2000I + Companion
2 100W solar panels
Flybob is offline   Reply With Quote
Old 03-29-2017, 09:42 AM   #10
Pickin', Campin', Mason
 
5picker's Avatar
 
Join Date: Aug 2015
Location: South Western PA
Posts: 11,904
There have been lots of reports here of water siphoning out of the fresh tanks going down the road. A misrouted vent line is usually the culprit.

There isn't anything in the plumbing that should suck water from the fresh tank when connected to city water UNLESS you were connected to city water AND had the pump on. You would have been using water from the fresh tank along with the supply from the city water.

You typically will not run the pump when connected to city water.
The only time you might is if you were at a rally or someplace where 4-5-6 campers were hooked to each spigot and the water pressure was so low you would need to supplement the city water with onboard water. Even then it would be best to just fill the fresh tank and use only the pump.
__________________
_________________________________________
2016 Flagstaff 8529IKBS Diamond Package 5th Wheel-Goodyear Endurance Tires
2017 Ford F-Series SCREW 4x4 - Factory Puck B&W Companion
TST Tire Monitor w/Repeater - Sinemate 3500w Gen.

Days Camped: '17=30 '18=51 '19=58 '20=83
5picker is offline   Reply With Quote
Old 03-29-2017, 09:42 AM   #11
Senior Member
 
northstar1960's Avatar
 
Join Date: Feb 2015
Location: in my new 29hfsxlr
Posts: 1,658
Quote:
Originally Posted by mj0528 View Post
Never mind, Judy answered my question. Hope I didn't screw up the pump
the pump should be off when on city water .
northstar1960 is offline   Reply With Quote
Old 03-29-2017, 09:59 AM   #12
far north Alabama
 
formerFR's Avatar
 
Join Date: Jan 2017
Location: far north AL
Posts: 2,801
you could also consider the 'low point' drain for the water tank, as it may have a slow leak below the rv, if not shut off tightly...
__________________

The Turners
'14 Thor Palazzo 33.3 compact diesel
KingTailgater2 Dish, 100w/5amps roof SOLAR, BlueOx, 100,000+mi since '14... US, Alaska, and Canada... GA, NC, now N AL : )
formerFR is offline   Reply With Quote
Old 03-29-2017, 10:20 AM   #13
Senior Member
 
Join Date: Mar 2017
Posts: 281
Quote:
Originally Posted by Flybob View Post
You won't hurt the pump if it is on when using city water., but you can cause the back flow valve to seat improperly and allow city water to fill the FW tank. You do not need the water pump on when on city water. If city water pressure is too low then use it to fill FW tank shut it off and use water pump to supply water from FW tank..


Got it, thanks!
mj0528 is offline   Reply With Quote
Old 03-29-2017, 01:21 PM   #14
Senior Member
 
A32Deuce's Avatar
 
Join Date: Nov 2012
Location: Mount Laurel, New Jersey
Posts: 9,000
I found on mine, if I fill the tank and leave Ill lose maybe a 1/4 to 1/3 of a tank. If I fill and put a piece of gorilla tape over the vent, then I arrive with a full tank according to gauge. Usually flushing and very little sink usage so it doesnt affect the tank. No wosh when I remove the tape!
__________________
2012 SunSeeker 3100SS Toad-1962 Futura Average 100 + days camping
A32Deuce is offline   Reply With Quote
Old 03-29-2017, 02:26 PM   #15
On the road again...
 
Join Date: Jul 2016
Posts: 48
We also have a 2015 Coachmen Encounter 37LS. Every time we are ready to head out my husband fills the fresh water tank. We have noticed a strong line of water all the way down the road for quite a distance. We asked our dealer and he didn't have an answer (or didn't want to mess with it). We still don't know what the problem is.

I must admit that I was excited to see a fellow Encounter RVer on the thread ...even if it was in regards to a problem!
__________________

2015 Coachmen Encounter
2001 CRV Toad
Let's go campin'!
MMMH is offline   Reply With Quote
Old 03-29-2017, 07:25 PM   #16
Senior Member
 
Join Date: Mar 2015
Location: Florida
Posts: 384
Quote:
Originally Posted by jubbabnr View Post
Prior to a trip, I filled the freshwater tank to 2/3 full (according to panel gauge). Only use was a few bathroom trips on our five hour trip. After 5 nights connected to campground water, tank was near empty and would barely pressure up. After adding water, everything worked fine. Grey and black tanks filled normally. There are no visible leaks. Our 2015 Coachman Encounter 36BH has a separate f.w. tank fill hose connection from the city water hose connector.

Question is, could there be some type of siphoning from the f.w. tank going on while running city water?
We used to have a Wildwood that had the same problem. I put a cap on the overflow tube which solved the problem completely. The water would slosh out of the tank while traveling.
__________________

__________________
OldBob

I may be old but I'm trying, very trying.
2015 RAM 1500 - EcoDiesel
Rockwood Ultra V 2715VS
OldBob is offline   Reply With Quote
Reply

Tags
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

Disclaimer:

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



All times are GMT -5. The time now is 08:20 AM.


×