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Old 12-20-2014, 04:01 PM   #1
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Smile demand water pump

RV is parked beside house. Went to turn on water in bathroom to use facility. Turned on pump, could hear pump working. When I turned on the faucet, water came out with good pressure and flow at first. Almost immediately flow and pressure went down to nothing. Then water would come out but at very little pressure or flow. Turned faucet off, pump still running and in a few seconds turned faucet on and the same thing. Holding tank is 3/4 full so I have water. Do I have to let pump run until it stops before using? Am I going to have to replace the pump? Any help is greatly appreciated.
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Old 12-20-2014, 05:41 PM   #2
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First check that valve that switches between water tank and city water is fully set properly. Next, remove aerators to faucet and clean out. The water pump, when turned on, runs until a preset pressure shuts it down. When everything is working the way it should, pump should shut off seconds after shutting off faucet. If it comes on in a while, or continues to run, it's either leaking somewhere to reduce pressure (look underneath for wet spots) or could be a bad check valve in pump allowing water to leak back to the tank.
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Old 12-21-2014, 07:04 AM   #3
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I found my system doesn't like to have air in it. Not sure if it would help to bleed all the faucets including the outside shower, etc.
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Old 12-21-2014, 07:44 AM   #4
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Most RV water pumps have a strainer or filter on them. If it gets clogged it will act the same way as you described. (Picture is from Internet)
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Old 12-21-2014, 07:57 AM   #5
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With water pump turned on, it should run until pressure is built up, then it should shut off and stay shut off until you open a faucet or flush the stool.

From your note, it sounds like either the pump is still filling the system (e.g. water heater, big on board water filters, etc.) prior to shutting off, OR, it's not getting a good supply of water to allow it to pump properly - for whatever reason. Clogged trash filter and selector valves set incorrectly the most common issues there.
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Old 12-21-2014, 10:36 AM   #6
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Thumbs up

Great suggestions. I will attempt the repair tomorrow. Follow up to come.
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Old 12-21-2014, 11:24 AM   #7
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Well, I had some time to look at the situation. Had supply lever in each position. turned on pump, ran for maybe 5-6 seconds then stopped. Opened faucet got about 3 seconds of water. then nothing. Turned lever to other setting and got the same results. Cannot get to the filter right now but that is the only element left to check. I have done all the other checks you suggest. If it is NOT the filter, am I going to need a new pump?
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Old 12-21-2014, 11:32 AM   #8
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See if I'm following you correctly?

You turn the pump on, it runs, then stops, telling you that the system is pressurized. Right?

At that point, you turn the water on, get 3 seconds of water, then nothing. Did the pump kick back on as soon as you opened the faucet? Did it remain on while the water was flowing? Did it stay running once the faucet was closed? If it stayed on after closing the faucet, did it eventually shut off by itself? If that's the case, and you left the pmp turned on for a period of time, does it stay off, or does it kick back on once in a while, all by itself, with out a faucet being turned on?
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Old 12-21-2014, 06:52 PM   #9
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Hi Mick327,
Based on your two posts, if this happens at all the faucets and the pump shuts off when all faucets are closed (allow a few seconds to build pressure) there are possibilities:
1. an obstruction
2. clogged filter (just another kind of obstruction)
3. replace the pump
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Old 12-22-2014, 08:04 AM   #10
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Red face

Quote:
Originally Posted by ahicks View Post
See if I'm following you correctly?

You turn the pump on, it runs, then stops, telling you that the system is pressurized. Right?

At that point, you turn the water on, get 3 seconds of water, then nothing. Did the pump kick back on as soon as you opened the faucet? Did it remain on while the water was flowing? Did it stay running once the faucet was closed? If it stayed on after closing the faucet, did it eventually shut off by itself? If that's the case, and you left the pmp turned on for a period of time, does it stay off, or does it kick back on once in a while, all by itself, with out a faucet being turned on?
Your first sentence is correct. The pump kicked back on when I opened the faucet, it remained on while the water was flowing. When I closed the faucet the pump shut off a couple of seconds later. It DOES NOT kick back on by itself. Aside from the scenario I mentioned it operates like a normal pump as far as I know. I tried both the bathroom faucet and kitchen faucet as well as the toilet and the results are the same. I have not tried to check the pump filter yet due to some back issues. I am really hoping that is the problem. Do I have to remove the pump to change the filter? Thank you and everyone else for your excellent suggestions.
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Old 12-22-2014, 10:07 AM   #11
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Typically the strainer between the tank and the pump can be cleaned without disturbing the pump. I'm puzzled at your description of working properly until it goes off when water flow stops but won't restart. How do you start it again? Do you have to turn on the pump switch? That's not the norm and I'm puzzled as to what causes the problem. If you hook up a jumper wire to the pump, see if the pump works as it should.
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Old 12-22-2014, 10:54 AM   #12
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Sorry, still not following. Puzzled as well.

First you say "Opened faucet got about 3 seconds of water. then nothing." That's not good.

Then you say "The pump kicked back on when I opened the faucet, it remained on while the water was flowing. When I closed the faucet the pump shut off a couple of seconds later." which sounds like it's working correctly.

Can we revisit what you're having difficulty with please?
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