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06-19-2020, 06:10 PM
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#1
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Junior Member
Join Date: Aug 2018
Posts: 26
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How much should remain in fresh water tank?
My EVO should have a 56 gallon tank. After the pump quits pumping any water, and I pull the drain, it appears to drain 10+ gallons. Shouldn't the pump be able to pick up water from near the bottom of the tank?
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06-19-2020, 06:59 PM
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#2
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Site Team
Join Date: Jan 2007
Location: Goodyear, Arizona
Posts: 33,855
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Did you account for the amount of water in the water heater? It's either 6 or 10 gallons of your 56.
__________________
Dan-Retired California Firefighter/EMT
Shawn-Musician/Entrepreneur/Wine Expert
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity
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06-19-2020, 07:12 PM
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#3
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Junior Member
Join Date: Aug 2018
Posts: 26
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Yes, I make sure that the entire system is full, when filling. Still what seems like a LOT of water when draining, after the pump can't get any more out.
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06-19-2020, 07:18 PM
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#4
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Senior Member
Join Date: Jan 2017
Location: KS
Posts: 2,369
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Mine says it has a 42gal tank. I have never been able to get more than 30gal into it. My water heater is 6 gallons and the lines hold 1.5gal based on my antifreeze usage...still short 4 gallons either way. No truth in advertising no matter how its calculated.
It sounds to me that the OPs problem is the intake line is a bit too short in terms of capacity or the RV was at a bad angle...
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06-19-2020, 07:52 PM
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#5
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Junior Member
Join Date: Aug 2018
Posts: 26
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Quote:
Originally Posted by dbledan
Mine says it has a 42gal tank. I have never been able to get more than 30gal into it. My water heater is 6 gallons and the lines hold 1.5gal based on my antifreeze usage...still short 4 gallons either way. No truth in advertising no matter how its calculated.
It sounds to me that the OPs problem is the intake line is a bit too short in terms of capacity or the RV was at a bad angle...
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You know, I've never measured how much I can get into it, but it is parked on the level on my RV pad when filling. The short intake line is my concern, hence the question. When the pump can't get anymore out, how much water should remain? Mine seems excessive, to me.
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06-19-2020, 08:10 PM
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#6
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Site Team
Join Date: Jan 2007
Location: Goodyear, Arizona
Posts: 33,855
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Quote:
Originally Posted by Alan H
My EVO should have a 56 gallon tank. After the pump quits pumping any water, and I pull the drain, it appears to drain 10+ gallons. Shouldn't the pump be able to pick up water from near the bottom of the tank?
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If you got the 56 gallons from the brochure or website, you do know there's fine print at the bottom. It says they can make changes to everything listed, at any time. There have been cases of them going to smaller tanks midseason.
__________________
Dan-Retired California Firefighter/EMT
Shawn-Musician/Entrepreneur/Wine Expert
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity
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06-19-2020, 08:27 PM
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#7
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Junior Member
Join Date: Aug 2018
Posts: 26
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Quote:
Originally Posted by bikendan
If you got the 56 gallons from the brochure or website, you do know there's fine print at the bottom. It says they can make changes to everything listed, at any time. There have been cases of them going to smaller tanks midseason.
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LOL, yer killin' me, Dan! The question is about how much water should remain in a tank where the pump can't get at it.
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06-19-2020, 10:15 PM
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#8
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Brake is on left
Join Date: Jul 2019
Location: USA
Posts: 1,095
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Well, I would think quite a bit could remain in the tank. Now, I havent measured exactly but my tank is about 6 feet wide and 3 feet long at the bottom. If there is only an inch of water then that is around 10 gallons. I know the pick up tube is not at the very bottom of the tank. So I could have 15 gallons left when the pump starts sucking air. That is a guesstimate anyway.
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06-19-2020, 10:25 PM
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#9
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Senior Member
Join Date: Jan 2017
Location: KS
Posts: 2,369
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Quote:
Originally Posted by Alan H
You know, I've never measured how much I can get into it, but it is parked on the level on my RV pad when filling. The short intake line is my concern, hence the question. When the pump can't get anymore out, how much water should remain? Mine seems excessive, to me.
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Yea 10gal is too much. I am not sure how the hoses connect inside the tank. You may be able to trace from the pump back to see if it got pulled a bit but I expect that there would not be a way to move it or it would eventually come all the way out.
If you have a gravity fill you could try checking by putting a boroscope in the fill to see where the pipes are. Maybe it is coiled inside and you could just pull some out but I doubt it would be that easy.
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06-20-2020, 12:50 PM
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#10
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Junior Member
Join Date: Apr 2020
Location: San Marcos
Posts: 3
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I have a 2017 EVO 2360 and have seen the same thing. When my water pump starts drawing air I can pull the drain and get almost 10 gallons out of the tank. I'm going to look into rerouting the intake so it is lower in the tank.
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06-20-2020, 12:57 PM
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#11
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Senior Member
Join Date: Jul 2017
Posts: 4,057
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Quote:
Originally Posted by Alan H
My EVO should have a 56 gallon tank. After the pump quits pumping any water, and I pull the drain, it appears to drain 10+ gallons. Shouldn't the pump be able to pick up water from near the bottom of the tank?
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Fact is the outlet is mounted on the side of the tank which leavbes water i the bottom of the tank . many tanks also have a drain that is at the bottom of the tank . So you could tap into the bottom drain for pump pick up and plug the existing out put for the pump and get more water out of the tank
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06-20-2020, 01:28 PM
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#12
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Site Team
Join Date: Jan 2007
Location: Goodyear, Arizona
Posts: 33,855
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Quote:
Originally Posted by Alan H
LOL, yer killin' me, Dan! The question is about how much water should remain in a tank where the pump can't get at it.
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Sorry, misunderstood your post.[emoji2957]
__________________
Dan-Retired California Firefighter/EMT
Shawn-Musician/Entrepreneur/Wine Expert
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity
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06-20-2020, 01:36 PM
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#13
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Pickin', Campin', Mason
Join Date: Aug 2015
Location: South Western PA
Posts: 19,152
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Quote:
Originally Posted by MR.M
Fact is the outlet is mounted on the side of the tank which leavbes water i the bottom of the tank . many tanks also have a drain that is at the bottom of the tank . So you could tap into the bottom drain for pump pick up and plug the existing out put for the pump and get more water out of the tank
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Correct.
Many pump supply ports are on the side of the tank and tend to suck air even when there is 10-15 gallons of water left in the tank.
This condition is also why it is often recommended to not put antifreeze in the fresh tank when winterizing because it would take lots of gallons just to get the level high enough for the pump to pick it up.
There have been several posts (especially from boondockers trying to get every gallon) on teeing off the drain line for the pump supply.
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2022 Cedar Creek 345IK 5th Wheel•Solar & Inverter•2024 Ford F-Series SCREW•7.3L•4x4•Factory Puck•B&W Companion•TST Tire Monitor w/Repeater•Sinemate 3500w Gen.
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06-20-2020, 02:17 PM
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#14
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Junior Member
Join Date: Aug 2018
Posts: 26
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Thanks, all. It looks like this may be normal. My trailer is parked at the curb out front, which makes it advantageous for the pump, as it isn't level. I ran the pump until it wouldn't even spit a bit, then drained the tank into a measured bucket. 5.5 gallons came out, meaning 7-8 gallons when level.
One thing I learned is that the toilet and faucets will run for a long time after the pump starts spitting air; probably another gallon, or two.
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06-20-2020, 02:54 PM
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#15
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Senior Member
Join Date: Jan 2017
Location: KS
Posts: 2,369
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I suppose the "easy" way to get all the water would be to hook a hose on the FW tank drain and connect it to the winterization port...then you are drawing from the lowest point. It would work in a pinch where you could not get more water. I would use my antifreeze hose for that but would not leave it hooked up that way.
Mine does pretty good. When I put 10gal in I am able to flush for a while on the road. Never measured after the pump stopped sucking water so I will have to check that.
If anyone fixes theirs I am curious how difficult it turns out to be.
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06-20-2020, 03:32 PM
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#16
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Senior Member
Join Date: Aug 2018
Location: Richmond VA
Posts: 4,564
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Look at the tank and where the outlet to the pump sits. If it's like nearly every tank I've seen it's on the side of the tank some distance from the bottom so a fitting can be screwed into it and can't possibly get all the water out unless you tip the tank toward that outlet. The only standard for useful capacity is it's always less than capacity.
Not only the outlet but filling tank to full capacity may not be possible so that 50 gallons is something less.
The fitting below appears to be a full inch or more off the bottom of the tank.
-- Chuck
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2006 Roo 23SS behind a 2017 Ford Expedition
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06-20-2020, 08:39 PM
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#17
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Senior Member
Join Date: May 2019
Location: Twin Cities, MN
Posts: 473
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I have a driveway that slopes down - not excessive, but does have a slope. My problem is I think I'm filling it up, but the tank fill hose is in the direction of the slope and starts running out the gravity connection when probably ⅓ full. So I've learned, where ever I am, that tank is going to appear full and really isn't andI will be short of water due to a poor tank fill design.
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2019 Forester 2861DS
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06-20-2020, 09:15 PM
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#18
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Senior Member
Join Date: Feb 2020
Location: Northern Foothils CA
Posts: 1,426
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Quote:
Originally Posted by Bob2019
I have a driveway that slopes down - not excessive, but does have a slope. My problem is I think I'm filling it up, but the tank fill hose is in the direction of the slope and starts running out the gravity connection when probably ⅓ full. So I've learned, where ever I am, that tank is going to appear full and really isn't andI will be short of water due to a poor tank fill design.
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I purchased one of these https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1 and found it surprisingly helpful and accurate.
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2021 2205S Rockwood Minilite
2019 F 150 Lariat 3.5 Eco Fx4 Max Tow
Equal-i-zer WDH, 1809 lb payload
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06-20-2020, 09:23 PM
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#19
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Senior Member
Join Date: May 2019
Location: Twin Cities, MN
Posts: 473
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Quote:
Originally Posted by flyflotrtim
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I like the water meter gauge idea, but it won't help get water into a tank that is spilling that water back out because of a slope. Poor design on my RV. Had two previous TT and never had this problem.
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2019 Forester 2861DS
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06-21-2020, 12:54 PM
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#20
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ARLO
Join Date: Oct 2008
Location: N Chili, NY
Posts: 910
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We have never used ours. Flagstaff 829 fks is 10 years old.
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