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Old 09-06-2022, 08:20 PM   #1
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Water pump/dry camping problem

Hello all,

Full timers here in an Alliance 310RL. Last late fall and thru winter we used the fresh tank and pump exclusively no problem.
In prep for this winter I figured I'd fill freshwater tank and test out the pump. Panel set to Powerfill and filled tank until it ran from the overflow . Set panel to Dry Camping, turned on the pump then i turned on a faucet to bleed air. Pump comes on and water flows fine but with no faucets opened the pump cycles on then off repeatedly about every two seconds. I've checked hose connections behind the panel and pump area. No water leaks I can see. Mesh filter is clean as a whistle. No leaks in any cabinets.

Any advice/recommendations will be greatly appreciated.

Thank you
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Old 09-06-2022, 08:58 PM   #2
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Pump cycling is a LEAK ----discharge side of pump not suction side
Fill Valve leaking thru
Pump internal check valve allowing backflow
City water inlet assembly check valve leaking
Water Heater T&P Relief Valve weeping
Exterior shower dripping

Common areas which cause pump cycling


Then could be leak from a fitting/connection anywhere on cold or hot plumbing lines


Pump pressure switch has a 15# differential between stop pressure & start pressure
Dropping 15# in 2 seconds is a lot.
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Old 09-07-2022, 12:38 PM   #3
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Quote:
Originally Posted by Old-Biscuit View Post
Pump cycling is a LEAK ----discharge side of pump not suction side
Fill Valve leaking thru
Pump internal check valve allowing backflow
City water inlet assembly check valve leaking
Water Heater T&P Relief Valve weeping
Exterior shower dripping

Common areas which cause pump cycling


Then could be leak from a fitting/connection anywhere on cold or hot plumbing lines


Pump pressure switch has a 15# differential between stop pressure & start pressure
Dropping 15# in 2 seconds is a lot.
I think I understand what you're describing. I'll take a better look at the piping directly connected to the pump output today and then the pump. My wife said she could hear (I couldn't - hearing sux) a swish sound from the pump between on cycles of the pump when it's doing it's cycling.
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Old 09-07-2022, 07:15 PM   #4
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Quote:
Originally Posted by Old-Biscuit View Post
Pump cycling is a LEAK ----discharge side of pump not suction side
Fill Valve leaking thru
Pump internal check valve allowing backflow
City water inlet assembly check valve leaking
Water Heater T&P Relief Valve weeping
Exterior shower dripping

Common areas which cause pump cycling


Then could be leak from a fitting/connection anywhere on cold or hot plumbing lines


Pump pressure switch has a 15# differential between stop pressure & start pressure
Dropping 15# in 2 seconds is a lot.
The OP mentioned he didn't find any leaks so I'd bet a few pennies the culprit is the pump's internal check valve. Pressure can go down quickly if it's not stopping the backflow.
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Old 09-11-2022, 12:17 PM   #5
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I think I'll just try swapping the pump for a new one and see. The current pump is a Pentair Shurflo, 3 GPM 7.5 amps. I've always thought the water presssure was a bit weak when using the pump. Can I safely replace with maybe a 3.5GPM model?
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Old 09-24-2022, 01:52 PM   #6
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Swapped the pump out. Runs fine, no cycling. Must have been the internal check valve as suggested before.
Thanks all!
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Old 09-24-2022, 03:50 PM   #7
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You should be able to purchase a rebuild kit for your old pump to keep for a spare.
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Old 09-24-2022, 06:09 PM   #8
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Water Pump related question: if you are hooked up to city fixtures and have lower water pressure from the campground source, can you turn on the water pump to “supplement” the pressure or does it only work with my fresh water tank? I know I can switch over to the fresh water tank and “dry camping” and use the pump for stable pressure, but wanted to ask the supplement question. Thanks - Rob
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Old 09-24-2022, 06:18 PM   #9
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My water pump supplements city water if it's low.
Over time you will need to refill the tank.
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Old 09-25-2022, 10:39 AM   #10
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Quote:
Originally Posted by mrboyer View Post
You should be able to purchase a rebuild kit for your old pump to keep for a spare.
Thanks! I'll see if thats available.
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Old 09-26-2022, 12:32 AM   #11
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Quote:
Originally Posted by twinboat View Post
My water pump supplements city water if it's low.
Over time you will need to refill the tank.


Thanks Twinboat - I’ll give it a go
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