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Old 09-28-2011, 05:33 PM   #1
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Water Pump

My Shurflow water pump surges on and off when we turn the water on in my 2000 Winn 40J, any ideas to the reason as my local RV shop doesn't have a clue.Tom

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Old 09-28-2011, 06:07 PM   #2
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Hi tbethurum,
Make sure:
1. power to the pump is correct. About 12.2 VDC or higher.
2. the water tank has enough water to provide an adequate supply of water.
3. Does the pump surge at all levels of water delivery. Full delivery, 1/2 delivery and a small delivery request?

There may be an internal problem with the pump. From time to time they need to be replaced.

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Old 09-28-2011, 07:28 PM   #3
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Many times this is due to air getting into the lines. check all fittings and another solution is to pop the safety valve on the water heater once in a while. This releases air pressure which will cause surging of the pump.
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Old 09-28-2011, 08:13 PM   #4
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When you open a faucet, the water pressure in the system drops and the pump turns on. When it builds up full pressure (about 40 psi), it shuts off. If you're not using much water this sounds like a series of short burps, if you're using more water the pump will stay on longer, but will still cycle on and off until you're using the full capacity of the pump. This cycle is normal for the usual pump manufacturers provide. If you upgrade to one of the VSD models, this cycling on and off is eliminated because the pump has a sensor that can turn it part way on if the demand is small.
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Old 09-29-2011, 10:52 AM   #5
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There is an adjustment screw on the the pump that might help.
The manual says to turn a faucet on enough to get a trickle and adjust the screw so the pump cycles every few seconds.
Then when the faucet is opened enough to get a good stream it should not cycle.
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Old 10-17-2011, 03:38 PM   #6
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Thanks for all that replied I adjusted the screw on the pump and now is working fine.

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