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Old 04-09-2019, 07:46 AM   #1
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Check valve on water pump?

Interesting problem popped up on our last camping trip. We were hooked up to electric and water for a couple of days when suddenly our fresh water tank started filling up and then overflowed. This had to come through the system which was hooked to the campground water supply. This is on a two year old Rockwood 2504s, isn't there a back flow preventor or check valve somewhere?
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Old 04-09-2019, 07:55 AM   #2
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Interesting problem popped up on our last camping trip. We were hooked up to electric and water for a couple of days when suddenly our fresh water tank started filling up and then overflowed. This had to come through the system which was hooked to the campground water supply. This is on a two year old Rockwood 2504s, isn't there a back flow preventor or check valve somewhere?
Yes. Check valve is in the pump.Try this. Turn city water off. turn on your pump on open a faucet and run some water. Turn pump off. Repeat the process. Turn pump off and turn city back on. This should clear your backflow valve. This happens when people turn the pump on with city water pressure on it. If the check valve is still faulty all you need is a rebuild kit. Easy to do. Amazon is your friend.
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Old 04-09-2019, 07:58 AM   #3
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Originally Posted by TsnTexas View Post
Interesting problem popped up on our last camping trip. We were hooked up to electric and water for a couple of days when suddenly our fresh water tank started filling up and then overflowed. This had to come through the system which was hooked to the campground water supply. This is on a two year old Rockwood 2504s, isn't there a back flow preventor or check valve somewhere?
That is my understanding.... either just beyond the pump on tank water side or I have heard some say that it is built into pump on some now.
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Old 04-09-2019, 08:04 AM   #4
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That is my understanding.... either just beyond the pump on tank water side or I have heard some say that it is built into pump on some now.
It has always been built into the head of the pump.
It is only not in the pump when someone mods the plumbing and adds a check valve.

The valve sticking from debris or being overcome by too high city pressure is a common topic and discussed here at least twice weekly.

Here is a search to past discussions. There are thousands of posts.

Fresh tank fills on city water.
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Old 04-09-2019, 03:48 PM   #5
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This has happened to me several times. Solved by installing a check valve on the output side of the pump. Tried it on the suction side but had some issues.
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Old 04-10-2019, 06:39 AM   #6
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Check valve

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Originally Posted by RStormC View Post
This has happened to me several times. Solved by installing a check valve on the output side of the pump. Tried it on the suction side but had some issues.
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Old 04-10-2019, 07:24 AM   #7
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Thanks guys, I'll rebuild or replace the pump head and look for an in-line check valve. Which check valve did you wind up using? I see several on amazon, but the reviews for those aren't great.
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Old 04-10-2019, 09:55 AM   #8
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Why would you not try the suggestion that cavie wrote about recycling the pump before buying parts and repairing something that might not even be broke? I've had what you have going on at least three times on two rv's and the recycle instruction has worked each time.
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Old 04-11-2019, 06:30 AM   #9
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That's a good point, because I didn't turn the pump on during the time I had water hooked up to campground supply (as he mentioned) I feel I can no longer trust the check valve in the pump. At the very least I want to add a check valve in the water line because the mishap strained my fresh water tank. Thankfully it didn't split open. Besides it's so much easier to make repairs at home before hitting the road.
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Old 04-11-2019, 07:10 AM   #10
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When mine failed I opted to put a check valve in line instead of fixing or replacing the pump since the pump's built in check valve will probably just fail again.

You can get the Camco brass check valve for under $15 and takes less than five minutes to install...no tools needed!

And will probably last as long as you own your RV.

I put mine right in front of the water pump and has worked great for a year now.
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