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Old 02-22-2015, 08:36 PM   #1
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Water Pump Surge

Let me start with the simple question before ya'll get too board with my long winded story.

Assuming I don't find any leaks in my plumbing...what can cause the water pump to surge?

I searched for some answers but nothing I found seemed appropriate...

We haven't moved the coach in a couple months and haven't had a problem with this. We have some pretty low water pressure here. I regularly fill the fresh water tank to get enough water pressure to do laundry and take a decent shower. So, yes, we do run the water pump as needed even connected to city water. Perhaps this is part of it but I doubt it.

Today after filling the tank and shutting off the water fill valve I started noticing the pump surge for 1-2 seconds every 30-45 seconds. I've inspected every water line and faucet to look for leaks and drips that I can readily access but can not find any leaks. Tomorrow I will look in the hard to get to places and the water heater bay. I was able to get a quick look behind that the hot water heater but didn't see anything. Also a quick check from inside the basement of the lining below the floor isn't showing any signs of water...yet anyway. Nor is there any sign of water in the water bay itself.

Just to see if there was some weird affect on low water pressure done every thing from bypassing my water softener, filters and even total disconnecting from city water. I'm still getting the surges.
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Old 02-22-2015, 08:58 PM   #2
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Possibly the check valve at the pump is letting water pressure bleed back.
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Old 02-23-2015, 01:37 PM   #3
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Possibly the check valve at the pump is letting water pressure bleed back.
Is that a rebuildable part or do I need to get a new pump?
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Old 02-23-2015, 02:21 PM   #4
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With the pump on, try and move the fill valve back and forth to see if any dirt got stuck while you were filling the tank. Then if that still doesn't work disconnect the hose and see if the surge still continues. On my coach there is a one way valve just inside the fill port where the garden hose connects. It is a spring loaded valve. See if it is leaking water back out. My guess it is this valve that is leaking a smidgen.
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Old 02-23-2015, 02:33 PM   #5
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It sounds like after shutting off the fill valve you are still sucking air trough it,try capping off your hose connection and see if that stops it.
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Old 02-24-2015, 07:25 PM   #6
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It sounds like after shutting off the fill valve you are still sucking air trough it,try capping off your hose connection and see if that stops it.
You might be pretty close...

I have tried capping it off and didn't see any difference. However, during the testing I do "exercise" the city water valve a few times. It seems that the valve wasn't sealing properly but, for now, the surging has gone away. I suppose that means I will have to consider replacing the city water valve in the future.

The question I need to get an answer to is if there is some kind of check valve built into the pump itself. That might play a part in this but I am purely guessing at that.
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Old 02-24-2015, 07:30 PM   #7
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Originally Posted by Sky_Boss View Post
You might be pretty close...



I have tried capping it off and didn't see any difference. However, during the testing I do "exercise" the city water valve a few times. It seems that the valve wasn't sealing properly but, for now, the surging has gone away. I suppose that means I will have to consider replacing the city water valve in the future.



The question I need to get an answer to is if there is some kind of check valve built into the pump itself. That might play a part in this but I am purely guessing at that.

There is a check valve in the water pump assembly on the input side. It keeps water from leaking back into the fresh water tank.


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Old 02-24-2015, 07:42 PM   #8
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Quote:
Originally Posted by Sky_Boss View Post
You might be pretty close...

I have tried capping it off and didn't see any difference. However, during the testing I do "exercise" the city water valve a few times. It seems that the valve wasn't sealing properly but, for now, the surging has gone away. I suppose that means I will have to consider replacing the city water valve in the future.

The question I need to get an answer to is if there is some kind of check valve built into the pump itself. That might play a part in this but I am purely guessing at that.
Newmar uses the same valve in our coach on the drain of the fresh water tank. It dripped for a while last summer then all of a sudden stopped and has not restarted. Probably some kind of crud in it that got washed out with exercising like yours. I really don't want to deal with replacing it, it has those crimp connectors on the pipe that are a pain to remove and replace and it's in a tight space right next to the water tank, so I'll wait until it leaks worse to replace it.
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Old 02-24-2015, 08:07 PM   #9
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Newmar uses the same valve in our coach on the drain of the fresh water tank. It dripped for a while last summer then all of a sudden stopped and has not restarted. Probably some kind of crud in it that got washed out with exercising like yours. I really don't want to deal with replacing it, it has those crimp connectors on the pipe that are a pain to remove and replace and it's in a tight space right next to the water tank, so I'll wait until it leaks worse to replace it.
I hear THAT! I was planning a major overhaul of the water bay this summer so I think while at it I will replace all valves while at it.
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Old 02-25-2015, 09:30 AM   #10
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The pump, depending on the model I guess, does have a check valve, or check valves but it may not be what you think. When my Aqua Tec was allowing water back into the fresh water tank I called the service tech and he had me attempt to open the pump and look at the check valves. The system consisted of a rubber type membrane with several plastic discs positioned on each side of the membrane. He said that wear on the discs or membrane are usually what causes leakage and the pump to run on or leak back into the FW tank. I broke one of the bolts holding the pump together and since that model had been discontinued I replaced it. I figured a ten year lifespan was acceptable.
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Old 02-25-2015, 09:44 AM   #11
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...The system consisted of a rubber type membrane with several plastic discs positioned on each side of the membrane. He said that wear on the discs or membrane are usually what causes leakage and the pump to run on or leak back into the FW tank. I broke one of the bolts holding the pump together and since that model had been discontinued I replaced it. I figured a ten year lifespan was acceptable.
To be honest, that is what I would do if the problem hadn't fixed itself...at least for the time being. I will probably preemptively replace it when I do the water bay project. 10 years isn't a bad run. LOL
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Old 02-25-2015, 09:55 AM   #12
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Originally Posted by Sky_Boss View Post
Let me start with the simple question before ya'll get too board with my long winded story.

Assuming I don't find any leaks in my plumbing...what can cause the water pump to surge?

I searched for some answers but nothing I found seemed appropriate...

We haven't moved the coach in a couple months and haven't had a problem with this. We have some pretty low water pressure here. I regularly fill the fresh water tank to get enough water pressure to do laundry and take a decent shower. So, yes, we do run the water pump as needed even connected to city water. Perhaps this is part of it but I doubt it.

Today after filling the tank and shutting off the water fill valve I started noticing the pump surge for 1-2 seconds every 30-45 seconds. I've inspected every water line and faucet to look for leaks and drips that I can readily access but can not find any leaks. Tomorrow I will look in the hard to get to places and the water heater bay. I was able to get a quick look behind that the hot water heater but didn't see anything. Also a quick check from inside the basement of the lining below the floor isn't showing any signs of water...yet anyway. Nor is there any sign of water in the water bay itself.

Just to see if there was some weird affect on low water pressure done every thing from bypassing my water softener, filters and even total disconnecting from city water. I'm still getting the surges.
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An "internal leak", (in the water pump itself). can cause the pump to run for 1-2 seconds every 30-45 seconds....(If your water pump has an "internal leak" you will NOT find, or "see", any water leaking).
Rebuild kits/parts are available for most RV water pumps.

EXAMPLES:
Shurflo Upper Housing with Switch - 2088 Series
And: SHURFLO Pump Diaphragm Drive Kit (2088)

If you don't find a leak, locate the make/model of your water pump and do a web search for "XXX water pump parts".

Mel
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Old 02-25-2015, 10:02 AM   #13
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Do you have an accumulator tank by any chance?


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Old 02-25-2015, 02:55 PM   #14
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Do you have an accumulator tank by any chance?...
Not that I am aware of. Would that be related to reverse osmosis?
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