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Old 01-01-2018, 09:49 PM   #1
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Freshwater tank backfilling on city water

The freshwater tank is backfilling when Iím on city water.

I can stop it temporarily by turning off the water, switching to the pump, running for a bit, and then turning the city water back on. I guess thereís a check valve that needs to be reseated.

But itís happened probably 3-5 times in the last 2-3 weeks.

I always use a pressure regulator and donít have both the pump on when I have city water connected.

Is the check valve in the pump user replaceable?

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Old 01-01-2018, 10:00 PM   #2
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One option is to not mess with the water pump and just install a check valve on the line between the fresh water tank and water pump.
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Old 01-01-2018, 10:03 PM   #3
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Not sure if it is easily replace able.
Try turning off city water and the pump, open hot and cold faucet to release pressure, close faucets then turn the pump on, run a little water, close faucets, turn off the pump and turn on the city water. If this doesn't reset the check valve it is probably bad.
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Old 01-01-2018, 10:05 PM   #4
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In fact, it looks like it would install in a minute between the white threaded fitting and the strainer on this side of the water pump in your photo.
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Old 01-01-2018, 10:13 PM   #5
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Quote:
Originally Posted by llr View Post
Not sure if it is easily replace able.
Try turning off city water and the pump, open hot and cold faucet to release pressure, close faucets then turn the pump on, run a little water, close faucets, turn off the pump and turn on the city water. If this doesn't reset the check valve it is probably bad.

I can get it to reset- it just unsets itself periodically (and lately frequently).
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Old 01-01-2018, 10:13 PM   #6
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Quote:
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In fact, it looks like it would install in a minute between the white threaded fitting and the strainer on this side of the water pump in your photo.

Interesting thought. Just add a new one...
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Old 01-01-2018, 10:24 PM   #7
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Originally Posted by ependydad View Post
Interesting thought. Just add a new one...
I have a couple plumbing mods I'm going to make this spring and adding another check valve on that line as a preventative measure is one of them.

Good luck.
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Old 01-02-2018, 07:33 AM   #8
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Edit: I can't see the model # in your photo but it looks like mine.

Hey Doug, to answer your original question- yes the pump can easily be disassembled and rebuilt. I cannot tell you what parts would cost but I know this--
Early this spring mine was acting up so I took it out and to the workbench.
I removed the 8(?) phillips screws and pulled the black plastic side away from the pot metal side. There is a large single piece rubber multil function diaphram in there.
That big square piece of rubber has a lot going on.
The pump is 4 chamber and that one piece takes care of all 4 chambers as well as having the back flow check valve built in. Replacing that would do it all I believe.

I did not replace mine. My issue was from the get go when the trailer was new if we turned on a faucet to a very low flow- just slightly more than a dribble- it would act funny. Instead of BRRRRR-pause-BRRRRR-pause like you would expect it would go into some sort of stuttery jiggedy-jiggedy-jiggedy sound with no pause.
Yeah it sound funny but if you say it out loud you get the idea. It got to where it
was doing that stutter even with faucets on full blast. This meant full blast wasn't.
It was only pumping less than half what it should.

I took apart the pump as described above and could not find anything wrong at all.
It all looked great with no debris or anything. What I found for MY problem was I discovered the pressure switch on the pump is adjustable. It takes a small (metric?) allen wrench. I gave it a full turn to the right and it solved my pump stuttering.
Pressure doesn't seem to be much more but flow is good.

You might disassemble yours and find a tiny piece of debris in the check valve or you
might not find anything at all. I can get mine out and on the bench in 5 minutes.
ME- I'd take it apart and look for damage or debris in the check valve.
As mentioned- I didn't pursue buying parts but I'd bet you can get them on Ebay by looking for your pump model number and repair kit. Donno if it would be cost effective as a new pump isn't too bad $$ wise. Also available on Ebay.
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Old 01-02-2018, 07:50 AM   #9
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Follow up thoughts-- Doug
OF course you can't use your water while the pump is out.
Turn off city water and shut off water heater just to be safe.
Relieve all pressure!!

If you take it apart and for some reason are unable to get it back together- you won't have water until you get it fixed/replaced.

In my case I was at home and wasn't worried about not having water
for a few days while I ordered parts. (which I didn't need after all)

Good luck!
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Old 01-02-2018, 10:00 AM   #10
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Freshwater tank backfilling on city water

Doug, here's what I've learned fooling with my pump and Uncle Gene's pump.
That little round anti-reversing valve IS user replaceable. You can buy parts for Shurflo pumps. You may or may not be able to buy just the anti-reversing valve (I'll post a pic below).
1. The problem I had (not your problem) is high campground pressure (apparently) had "jammed" my valve into the hole it was meant to plug to the point it wouldn't free up when it should have. Thus it wouldn't pump from the fresh water tank. I took the pump apart and pushed with both thumbs "with all my might!" until it popped out and across the room. The little round valve has a rubber O-ring seal but apparently the plastic valve stuck in the plastic hole and the O-ring wouldn't always prevent it. For this problem, I learned to open a faucet, turn on the pump, set my anti-freeze valve to open the anti-freeze hose. Then I blew into that hose (yes, with all my might) until I unjammed the valve and got the pump to prime and pump fresh water. [My trailer is now in a service department for several extended warranty issues and the warranty is covering the installation of a new pump.]
2. Uncle Gene's SOB unit kept overflowing the fresh water tank when on campground water - same problem as yours. We did all the suggested methods of clearing whatever was holding the anti-reversing valve open when it should have been closed. We could never clear it. He had a service department install a check valve as described above which solved his problem for a while. Later, his pump stopped priming from the fresh water tank (same symptom as #1 above). When I removed his pump (MUCH more difficult than removing mine) and disassembled it, I found that his rubber O-ring has come out of its slot and had caused the anti-reversing valve to jam in the hole - same is mine. For his first problem, the messed up O-ring was hold the valve open and overflowing the tank. Then the O-ring moved enough to jam the valve in the hole and cause problem #1 above. We found a correct O-ring in his stash and fixed it. { It turns out the in-line check valve he had installed took up too much space where the water line went through the floor and made my R&R job harder.} Yeah... I know. You're asleep from reading this. Now wake up and fix something!

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Anti-reversing valve is the little circle eccentric to the big circle in the middle.
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