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Old 08-07-2022, 04:09 PM   #1
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Name: Paul
Trailer: 2005 Scamp 19' 5th Wheel
Oregon
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water pump keeps running

Advice for why my water pump keeps running after I close the valve?

I have a 2005 19' Scamp with original Shurflo pump. Whether I use the cold or hot, shower, toilet, or sink, the pump continues to run for a few seconds after closing the valve.

I've purged all the lines of air. I've taken out the pump and inspected the strainer and baffles for debris or foreign matter. I've checked for leaks throughout the system and found none (and it does run in any case unless the water valve is or has just been open). And I've tried to adjust the pressure switch in both directions (not easy given the philips screw and proximity to the wall).

I can live with it, but I worry that it's putting additional and unnecessary stress on the motor and pump.
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Old 08-07-2022, 06:19 PM   #2
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If its just for a few seconds or even a little longer thats normal, it runs till it reaches a certain water pressure.--Frank
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Old 08-07-2022, 07:37 PM   #3
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Registry
ACCUMULATOR?

Quote:
Originally Posted by Ottoscamp View Post
Advice for why my water pump keeps running after I close the valve?I have a 2005 19' Scamp with original Shurflo pump. Whether I use the cold or hot, shower, toilet, or sink, the pump continues to run for a few seconds after closing the valve.
Mine runs for a couple of seconds after I stop the flow but I have an accumulator. If you keep the power off to the pump and turn a faucet on do you get a few seconds of water?
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Old 08-07-2022, 08:34 PM   #4
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Quote:
Originally Posted by frthompson View Post
If its just for a few seconds or even a little longer thats normal, it runs till it reaches a certain water pressure.--Frank
Thanks. It seems to me that it didn't used to do so, and then I saw a video at the Escape website about pumps that suggested adjusting the pressure switch would get it to shut off immediately after the water stops (and that this was desirable). All I can accomplish with that adjustment is to delay the pump from turning on; it has no effect on how long it runs after the valve is shut off.
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Old 08-07-2022, 08:35 PM   #5
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Quote:
Originally Posted by AC0GV View Post
If you keep the power off to the pump and turn a faucet on do you get a few seconds of water?
I haven't checked this, but I don't see an accumulator anywhere along the line.
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Old 08-08-2022, 04:38 PM   #6
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Quote:
Originally Posted by Ottoscamp View Post
I haven't checked this, but I don't see an accumulator anywhere along the line.
Any trapped air in the pressurized water system will behave like an accumulator. This often happens in water heaters. I see this as a useful thing, not a problem.

--Dan Meyer
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Old 08-09-2022, 08:42 AM   #7
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mine always runs 5-10 seconds, and it also cycles as the taps are on
Joe
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Old 08-13-2022, 02:38 PM   #8
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Name: George
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Just a thought…..If your tank is low on water it will run continuously.
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Old 08-13-2022, 03:06 PM   #9
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Another thought to trow in: All plumbing is plastic and therefore not as rigid as house plumbing (steel or copper) and expands with water pressure. Therefore the plumbing (all lines combined) acts as an accumulator.
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Old 08-13-2022, 03:11 PM   #10
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Send a message via Yahoo to Darwin Maring
It's normal
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Old 08-21-2022, 08:59 PM   #11
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Quote:
Originally Posted by Dan Meyer View Post
Any trapped air in the pressurized water system will behave like an accumulator. This often happens in water heaters. I see this as a useful thing, not a problem.

--Dan Meyer
Water heaters are SUPPOSED to have a head of air in them. The instructions for both Suburban and Atwood/Dometic detail this and how to restore the air "head" which you should do every so often.

PRESSURE-TEMPERATURE RELIEF VALVE
 WARNING
EXPLOSION
• Do not place a valve, plug or reducing coupling on outlet part of
pressure-temperature relief valve.
A Pressure Temperature Relief Valve, dripping while the water heater is
running, DOES NOT mean it is defective. During normal expansion of
water, as it is heated in the closed water system of a recreation vehicle,
the Pressure Temperature Relief Valve will sometimes drip. The
Dometic water heater tank is designed with an internal air gap at the
top of the tank to reduce the possibility of dripping. In time, the
expanding water will absorb this air and it must be restored.
 WARNING
SCALDING INJURY
• Turn off water heater before opening pressure-temperature relief
valve to establish air space. Storage water must be cool.
TO REPLACE THE AIR GAP FOLLOW THESE STEPS:
1. Turn off main water supply (the pump or water hook up source).
2. Let water cool or let run until cool.
3. Open the hot water faucet closest to the water heater.
4. Pull handle of pressure temperature relief valve straight out and
allow water to flow until it stops.
5. Allow pressure temperature relief valve to snap shut; close faucet;
turn on water supply.
6. Turn on water heater and test.

• At least once a year manually operate pressure-temperature relief
valve (FIG 10).
When pressure-temperature relief valve discharges again, repeat above
procedure. For a permanent solution, we recommend one of the following:
• Install a pressure relief valve in cold water inlet line to water heater
and attach a drain line from valve to outside of coach. Set to relieve
at 100-125 PSI.
• Install a diaphragm-type expansion tank in cold water inlet line.
Tank should be sized to allow for expansion of approximately 15 oz.
of water and pre-charged to a pressure equal to water supply
pressure. These devices can be obtained from a plumbing
contractor or service center.
__________________
'03 Ram 2500 CTD, 5.9HO six speed std cab long bed Leer top and 2008 Bigfoot 25B21RB.. Previously, 2008 Thor Freedom Spirit 180, SOLD! 2007 Winnebago View 23H Motorhome, SOLD!
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