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09-07-2020, 05:43 PM
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#1
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Established Member
Join Date: Sep 2019
Location: Costa Mesa
Posts: 37
M.O.C. #24836
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Fresh water full?
Is there a way, besides looking at unreliable sensor lites, to know when my fresh water tank is full while filling? I have a 353RL. My motor home had a vent right at the fill station that would burp when the tank was full. My fill station valve on the MHC says City Water full flow horizontal and fill vertical. The sensor seems to read 1/3 all the time. Of course I don't want a flood. Sorry but I can't upload a photo from my phone to this forum. Any help would be appreciated. Randy
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09-07-2020, 05:59 PM
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#2
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Montana Fan
Join Date: Jan 2020
Location: Hilliards
Posts: 237
M.O.C. #25636
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Usually when the fresh water tanks are full there is an overflow that will run out to the ground somewhere underneath. Filling the tank until it overflows is really about the only way to know for sure that you are full! Good Luck!
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2020 MHC 330RL
2021 F350 DRW 6.7 Powerstroke
Retired and Rollin'!
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09-07-2020, 06:17 PM
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#3
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,713
M.O.C. #24086
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__________________
Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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09-07-2020, 06:39 PM
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#4
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Montana Master
Join Date: Oct 2018
Location: Anderson
Posts: 2,609
M.O.C. #22835
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I fill mine until the overflow vent overflows. On mine, the fill port is in the wet bay in the front of the camper, the water tank is all the way to the back. On the side of the camper, in the rear, is a vent. It's not noticeable, but it's there. When the tank gets full, it spews over. Turn the water source off, and disconnect. It will stop spewing in a few seconds.
On mine, it's that brown bump out thing, that is just to the left and up of the red running light.
__________________
History is not about the past, it's an explanation of the present.
2019 Montana High Country 375FL
2014 Chevy Silverado Duramax, 6.6L Dually
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09-07-2020, 06:51 PM
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#5
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Montana Master
Join Date: Mar 2015
Location: West Richland
Posts: 1,253
M.O.C. #17164
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I agree with Jeff, you can also see water spewing out the overflow when going around corners to right When driving uphill.
Tom Marty
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09-08-2020, 04:59 AM
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#6
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Montana Master
Join Date: Oct 2019
Location: Jacksonville
Posts: 2,146
M.O.C. #25165
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I have a water meter as suggested as well. Only problem is, unless you completely drain tank each time, you don't know how much to put in to fill it. Also, I learned that my tank isn't 66 gallons. 12 gallons of that is the water heater and then some more is accounted for in the pex lines. I can only put about 48 gallons in before overflow.
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Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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09-08-2020, 06:04 AM
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#7
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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I take the cap off the overflow and then wait till I see water coming out.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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09-09-2020, 10:10 AM
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#8
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Established Member
Join Date: Sep 2019
Location: Costa Mesa
Posts: 37
M.O.C. #24836
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Quote:
Originally Posted by DutchmenSport
I fill mine until the overflow vent overflows. On mine, the fill port is in the wet bay in the front of the camper, the water tank is all the way to the back. On the side of the camper, in the rear, is a vent. It's not noticeable, but it's there. When the tank gets full, it spews over. Turn the water source off, and disconnect. It will stop spewing in a few seconds.
On mine, it's that brown bump out thing, that is just to the left and up of the red running light.
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Haha! Often wondered what that thing was. Just another thing the dealer didn't tell me during walk thru. I've learned more from you folks than they ever thought to teach me. About the only thing they're go at is collecting money. Thanks again. Hope I'm on the giving end of this some day soon.
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09-09-2020, 11:54 AM
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#9
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Montana Master
Join Date: Aug 2020
Location: Keller
Posts: 503
M.O.C. #26851
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Quote:
Originally Posted by DutchmenSport
I fill mine until the overflow vent overflows. On mine, the fill port is in the wet bay in the front of the camper, the water tank is all the way to the back. On the side of the camper, in the rear, is a vent. It's not noticeable, but it's there. When the tank gets full, it spews over. Turn the water source off, and disconnect. It will stop spewing in a few seconds.
On mine, it's that brown bump out thing, that is just to the left and up of the red running light.
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BTW, that overflow cover is removable. Just pull straight up, it will come off. There is a screen in there that will come out easily.
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09-09-2020, 12:00 PM
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#10
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Montana Master
Join Date: Aug 2020
Location: Keller
Posts: 503
M.O.C. #26851
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Quote:
Originally Posted by RMcNeal
I have a water meter as suggested as well. Only problem is, unless you completely drain tank each time, you don't know how much to put in to fill it. Also, I learned that my tank isn't 66 gallons. 12 gallons of that is the water heater and then some more is accounted for in the pex lines. I can only put about 48 gallons in before overflow.
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Well that is interesting! I’m supposed to have a 62 gallon tank. I just received my water meter so I’ll have to check that out. I have a 12 gallon water heater as well. 🤔
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09-10-2020, 10:01 AM
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#11
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Montana Fan
Join Date: May 2017
Location: Columbia
Posts: 144
M.O.C. #19789
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Quote:
Originally Posted by Mikelff
BTW, that overflow cover is removable. Just pull straight up, it will come off.
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Ours is molded on and does not come off.
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Ray and Susan
2017 - HC352 RL
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09-10-2020, 03:09 PM
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#12
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Montana Master
Join Date: Aug 2020
Location: Keller
Posts: 503
M.O.C. #26851
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Quote:
Originally Posted by rslopez65
Ours is molded on and does not come off.
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Mine is a 2018 model. Is yours an older model? I was under the impression that all the monty’s used this same overflow cover. Anyway, mine comes off and can gravity fill using a funnel and hose/tube to sanitize or add antifreeze.
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09-11-2020, 08:54 AM
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#13
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Montana Fan
Join Date: May 2017
Location: Columbia
Posts: 144
M.O.C. #19789
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Quote:
Originally Posted by Mikelff
Mine is a 2018 model. Is yours an older model? I was under the impression that all the monty’s used this same overflow cover. Anyway, mine comes off and can gravity fill using a funnel and hose/tube to sanitize or add antifreeze.
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We ran the back end into something or something jumped out and ran into the back end. The replacement part included the side panel with the overflow bit. We were surprised that it no longer came off. Thought we might have problems but so far none have occurred.
__________________
Ray and Susan
2017 - HC352 RL
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09-13-2020, 05:22 PM
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#14
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Montana Fan
Join Date: Jul 2016
Location: Georgetown
Posts: 307
M.O.C. #18751
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I do what Dick does^^^^^^^^
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09-13-2020, 06:51 PM
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#15
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Seasoned Camper
Join Date: Dec 2018
Location: Peru
Posts: 85
M.O.C. #23153
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Water meter
Quote:
Originally Posted by Daryles
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I have two of these, one for the fresh water and the other is for rinsing out the black tank. I try to stay at 75% of the tank's specs sheet. I don't trust the specs due to an obvious error I see with mine.
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