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03-26-2014, 09:48 AM
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#1
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Junior Member
Join Date: Nov 2013
Location: Colorado
Posts: 5
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water pump question
We went camping this weekend in our Montana 2980rl (2004). Filled fresh water tank completely and after several days and alot of water usage, the water pressure dropped to almost nothing. Fresh tank level monitor said E, which I expected. We wanted to test how long we could go on one tank for boondocking later. Surprisingly though, when we emptied hot water heater it was nearly full. Also, when we opened fresh water drain, it drained out several gallons. I took precautions to ensure we were level on campsite. Anyone can help with this? It seems the pump stops providing enough pressure when water is low, but not empty? Pump was still running and air bubbles were in the line, which is why I thought tanks were empty. Also, should it pump all water out of hot water heater even if fresh is low?
Thanks,
Derek
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03-26-2014, 10:06 AM
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#2
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Senior Member
Join Date: Jan 2013
Location: Golden Co
Posts: 367
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water pump question
When the pump starts sucking air out of the fresh water tank, it stops pumping. Maybe a little air gets pumped, but nothing useful.
That leaves the WH and the piping downstream of the pump full.
The Pump is between the fresh tank and WH, so the pump can't pump out of the WH.
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Mark S.
2014 Cougar 318SAB
2015 Silverado 3500HD 6.6L Diesel 4WD CC SB
18K Pullright Hitch
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03-26-2014, 11:56 AM
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#3
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Senior Member
Join Date: Jun 2013
Location: Watervliet, Michigan
Posts: 213
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On my last trailer, the tank outlet to the pump was on the side of the tank near the bottom. The tank drain came from the bottom. The pump would start sucking air before the tank was completely empty but when you opened the the drain there was still water in the tank. I am guessing yours is the same way.
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Brett, DW Theresa, DD Brenna
2013 Fuzion 342 Monster
2009 Harley FLHX
2 Wieners Maddie and Mollie
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03-26-2014, 12:39 PM
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#4
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Senior Member
Join Date: May 2010
Location: Rochester, NY
Posts: 1,605
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X2 what was said above. Air bubbles will cause the pump to lose prime before the tank is empty. Most poly water tanks tend to have a low spot or two depending on how the tank supports are configured.
Water heater doesnt empty unless you pull the plug and drain it.
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03-27-2014, 12:42 AM
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#5
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Senior Member
Join Date: Feb 2013
Location: MA
Posts: 3,153
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Common stuff so you are not pumping any crud that might be in the very bottom of the tank. The pump will pump water to the he tank but with no pressure behind it it will not empty the tank. This is a good thing as you would burn it out possible if the tank was empty.
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2013 Premier 31BHPR
2014 F350 6.2L
Soon to be just DW and I
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03-27-2014, 06:22 AM
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#6
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Senior Member
Join Date: Apr 2011
Location: Arrey,
Posts: 2,368
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xray350, Howdy;
Now you know why there is water left when the pump stops.
The reason your monitor shows E when it's not and F before it
truly is because they need some space to mount the studs into
the walls of the tanks. The E is probably at the inch or 2 above
the bottom, the F is probably an inch or 2 below the top, the
middle one is left up to, as I refer to it, "The Stolfitz Kid" as to
how close to the middle it truly is.
hankaye
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Striving for a less complicated life since 1949 ...
Home: 2008 Cougar 278 RKS
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Dog: 2006 Border Collie (Rascal) aka Maximum fur dispersal unit. (08/04/2006 - 12/16/2017) RIP.
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03-27-2014, 10:00 AM
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#7
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Senior Member
Join Date: Nov 2012
Location: Fruitland
Posts: 3,357
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Afew years ago I tested my Artic fox and found same thing happpened. I believe the others comments are right and if I tested the current trailer I would get same results. I know that when the light shows 1/3 I need more water.
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2013 24RKSWE (27ft TT) Cougar 1/2 ton series SOLD 10-2021
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Retired from Oregon State Police in 2011 than worked another 9.5 years as a small town traffic cop:
As of 05-2020, I am all done with 39 years total police work. No more uniforms for me.
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