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Old 07-19-2015, 10:29 PM   #1
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Water pump

Hello folks I have a question about my water pump I have a class C. After flushing the The bathroom the water pump would go on one or two times maybe a couple minutes after flushing
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Old 07-19-2015, 10:32 PM   #2
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And now it seems after flushing the bathroom The water pump will go on maybe five times. 5 to 10 minutes after I flushed. do I have a leak somewhere.
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Old 07-19-2015, 10:35 PM   #3
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Quote:
Originally Posted by on2thenext View Post
Hello folks I have a question about my water pump I have a class C. After flushing the The bathroom the water pump would go on one or two times maybe a couple minutes after flushing

A little more info.
What breed of class A are we talking about?
Are you connected to city water?

The pump is designed to start on a low pressure. IE, when you open a tap and the pressure in the system drops, the pump starts and draws water from the fresh water tank to the open tap. Close the tap, the pressure builds up and finally shuts off when the set point is reached.
That is the basic design of RV water pumps.
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Old 07-19-2015, 10:47 PM   #4
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If you had a leak, the pump would alsocome on at random times.

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Old 07-19-2015, 10:57 PM   #5
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I have a class C . I am not hooked up to city water. Like I mentioned when I use to flush the bathroom the pump would come on and do it's thing. and a minute or two later it would come on one more time. But now when I flush the bathroom the pump will come on do it's thing and several minutes later it will repeatedly come on at least five times up to 10 minutes after I have flushed and then it will stop
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Old 07-20-2015, 06:15 AM   #6
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Check the check valve in the pump intake side. I installed a new pump and water was going back in the tank once pump shut down and pump came pack on to pressurized the system. So I went to the hardware store and bought another inline check valve. System works great.


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Old 07-20-2015, 04:25 PM   #7
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Yes, it sounds like you have a leak. Having the pump come on by itself when no water is being used is a classic leak indication. If you don't see water spraying or dripping anywhere, it could be pump's internal valves are leaking and the water is going back into the tank just like Johndale describes.

If you have a shutoff valve between the water tank and the pump inlet, try closing it immediately after the pump first stops after a flush. Wait long enough to see if the pump still tries to cycle. If it does not, then you have found your leak: it's the pump. If it does try to cycle, open that valve right away or else the pump will be straining against the closed valve.

Does it ONLY happen while flushing? if so, it could be a leak inside the toilet. Open a sink valve long enough for the pump to start pumping, then turn it off. Does the pump stop and stay stopped? If so, the leak could be in the toilet (maybe the water valve is sticking and it's taking a few minutes for the it to close completely?) If it still does the cycling, then it's likely not the toilet and is elsewhere.

Don't let this just sit without figuring out what's going on. You could be having a leak in a hidden spot, and not notice it until it's done a lot of rot and damage.
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Old 07-20-2015, 05:03 PM   #8
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If it only does it when the toilet is flushed I would be suspect of the flush valve in the toilet not sealing right away maybe something as simple as a weak spring.


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Old 07-20-2015, 05:53 PM   #9
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If it only does it when the toilet is flushed I would be suspect of the flush valve in the toilet not sealing right away maybe something as simple as a weak spring.


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X2 on this. Most likely the toilet valve is not seating properly and you have some trickle taking place.
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