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06-04-2023, 04:48 PM
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#1
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New Member
Join Date: Jun 2023
Location: Stanwood
Posts: 8
M.O.C. #32820
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Elec pump
When on city water and electric pump is turned on does it pump water from city water or fresh tank? Thanks
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06-04-2023, 04:52 PM
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#2
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New Member
Join Date: Jun 2023
Location: Stanwood
Posts: 8
M.O.C. #32820
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Oops…. For 2022 3931
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06-04-2023, 05:04 PM
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#3
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Site Team
Join Date: Apr 2017
Location: Colorado Rockies
Posts: 1,840
M.O.C. #19755
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The water tank....if the pump runs. However, it will probably not run. The water pump shuts off when pressure builds on the output side. With city water pressure applied, the pump should not run.
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Scott & Alta
2017 Montana 3160RL, Legacy, Onan 5.5Kw, Solar
2022 F-450 Lariat Ultimate
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06-04-2023, 07:22 PM
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#4
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Montana Master
Join Date: Jan 2022
Location: Shingle Springs
Posts: 1,889
M.O.C. #30417
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What Scott said. Pump won't run if set to city water. Pump will pull water from the fresh water tank if it has water water in it and the switch is set to fresh water tank.
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Tony & Donna
2022 Montana High Country 295RL, Solar Flex 400, Onan 3600 LPG, 2K inverter, 200AH Lithium. 2020 GMC Denali 2500 6.6 Duramax, Demco 21K Auto Slide
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06-04-2023, 07:34 PM
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#5
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,615
M.O.C. #12947
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The pressure switch for the water pump is located on the pump itself. If the pressure in the water plumbing system from the city water connection is below the setting of the pressure switch, the pump will operate. If the pressure coming in is higher than the pressure switch setting, the pump will not operate.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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06-04-2023, 11:13 PM
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#6
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New Member
Join Date: Jun 2023
Location: Stanwood
Posts: 8
M.O.C. #32820
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Thanks; so, my city water pressure is indeed below the pump setting so the pump does run, but is it using city water or drawing from the fresh water tank? This is my first RV of any kind (2022 Montana 3931) so is a learning curve.
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06-04-2023, 11:20 PM
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#7
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Site Team
Join Date: Apr 2017
Location: Colorado Rockies
Posts: 1,840
M.O.C. #19755
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Quote:
Originally Posted by Johndavis
Thanks; so, my city water pressure is indeed below the pump setting so the pump does run, but is it using city water or drawing from the fresh water tank? This is my first RV of any kind (2022 Montana 3931) so is a learning curve.
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I thought it was a hypothetical question. You should not have your pump turned on when you are connected to city water. You are just wearing it out for no reason.
__________________
Scott & Alta
2017 Montana 3160RL, Legacy, Onan 5.5Kw, Solar
2022 F-450 Lariat Ultimate
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06-05-2023, 10:07 AM
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#8
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New Member
Join Date: Jun 2023
Location: Stanwood
Posts: 8
M.O.C. #32820
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Yes it was hypothetical. What I didnt mention is that we are actually connected to well water at 40 psi and the flow at faucets, etc is puny unless pump is on. Pressure at faucets with pump off is ok for two seconds and then reduces to about half-flow; hence we leave pump on and pressure is good. But I was wondering if it is then using fresh water.
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06-05-2023, 11:32 AM
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#9
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Montana Master
Join Date: Jun 2017
Location: POINTBLANK
Posts: 1,826
M.O.C. #19944
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Well, in some CG the pressure is low so when showering I turn the pump on for a better shower. Usually have a full tank anyway
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 RAM 22' DRW 3500 Crew LB 40 gal reserve tank / RETRAX Bed Cover / 2020 373RD HC / IS / MOPEKA Tank Monitor / Furrion Side&Rear Cameras
Slide Toppers / EMS-HW50C / Sailun 85's
3rd AC / Dometic 320
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06-05-2023, 03:02 PM
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#10
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Site Team
Join Date: Apr 2017
Location: Colorado Rockies
Posts: 1,840
M.O.C. #19755
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Quote:
Originally Posted by Johndavis
Yes it was hypothetical. What I didnt mention is that we are actually connected to well water at 40 psi and the flow at faucets, etc is puny unless pump is on. Pressure at faucets with pump off is ok for two seconds and then reduces to about half-flow; hence we leave pump on and pressure is good. But I was wondering if it is then using fresh water.
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Got it, thanks for the explanation. Yes, in that case, you are using some of your on board fresh water.
__________________
Scott & Alta
2017 Montana 3160RL, Legacy, Onan 5.5Kw, Solar
2022 F-450 Lariat Ultimate
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06-05-2023, 09:15 PM
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#11
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,615
M.O.C. #12947
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When the pump runs, it’s pulling water from the tank. The tank line is the only source of water to feed the pump.
__________________
Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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06-14-2023, 03:13 PM
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#12
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Montana Fan
Join Date: Aug 2020
Location: Keller
Posts: 489
M.O.C. #26851
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If your city water pressure is too low, you should fill your fresh water tank and use it with your water pump to get higher water pressure. When/ If you don’t need higher water pressure use the city water, or you can end up using both but make sure not to overfill your fresh water tank. It will send the overflow out your overflow hose on your tank and dump it on the ground.
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