Fresh water tank filling when connected to city water

[Meateater]

As the title says... We have a 2020 Geo Pro 19fd. My water pressure gauge was set to 40-45 psi. This just started and I don't know why. Any ideas would be appreciated. No other problems to report. Great trailer.

[bikendan]

Originally Posted by Meateater

As the title says... We have a 2020 Geo Pro 19fd. My water pressure gauge was set to 40-45 psi. This just started and I don't know why. Any ideas would be appreciated. No other problems to report. Great trailer.

Stuck check valve on water pump.
Hundreds of posts here about this common issue. A quick search will get you weeks of reading about it.

[Meateater]

All I see is people running water pump when connected to city water. Been searching for an hour now.

[HangDiver]

Sometimes with newer trailers debris in the plumbing lines gets caught in the water pump check valve. You can try and clear it out by:

1) Disconnect from City water;
2) Turn on water pump;
3) Open and close water faucets over and over to make the pump run on and off to try and clear debris from the valve;
4) Turn pump off and reconnect to city water.

You might have to go through the above sequence several times to get it fixed.

Good luck

[Meateater]

Thanks... yes I did that. I think I'm going to disconnect the pump and blow air through. I was hoping there was a simpler problem that my simple brain didn't figure out. Thanks again.

[SlowrideHD]

The simple thing is to turn off the city connection and just use your water pump, now that your tank is full.
This is the most common issue on this forum, probably comes up once a week. Stuck check valve at the water pump.

[kfd82]

Turn off city water
Open faucets until no water pressure
Turn on water pump
Open faucet
Turn off water pump
Once there is no pressure on the lines you can turn the city water back on.


This has happened to me twice (the check valve getting stuck) and the above steps worked each time.

[RookieRV]

I don't know how the Geo is configured but in my Rockwood the shower has a bypass valve that, when opened, will divert water into the fresh water tank. That happened recently when a couple had just bought a Rockwood and the DW used the diverter to stop the shower: "Well the water stopped coming out." Just a thought. Very well could be the water pump.

[Tundra 2014]

As others said, it is the check valve off the water pump. Especially on new units, it just takes a small piece of construction trash to hold that valve open and that allows the FW tank to be filled. I had to do mine several time to get the trash out. Empty you low water drains w/ city water off and hot water heater off. And take the valve apart. It has a small screen in it that can be cleaned out.
If someone (DW) turns pump on and it has more water pressure than city water, it can sometimes do the same thing on my trailer.

[lesgemar]

I have a 2304 DS. Mine does the same thing. Look in the shower, there is a water saver lever you can use to shut off the shower head when soaping up, etc. if you use this lever when connected to city water, it will fill and overflow your fresh water tank. This is a known issue to Forest River, as they have a sticker in the shower warning this will happen. This lever is only to be used when running off the fresh water supply and the water pump.

[Brother Les]

If you have debris in your fresh water water pump check valve and you 'blow it out', you may just blow the junk into a place that you do not want it and the valve will really be stuck open.

[Arnie M]

Had the same issue last time out.
It was my mistake. We were on city water and I set the valves to system use rather than city water hook up.
It wasn’t until the next day I saw water dripping from the open fresh water tank drain valve.
Even with the valves set incorrectly the fresh water tank should have not taken water.
I had to reset the pump check valve by filling the fresh water tank enough to run the pump. Once the lines pressured up and the pump turned off I knew the check valve reset (took a few times opening and closing a faucet). I then turned the pump switch off and swung valves to city water.
No issue after this.

[camaraderie]

Note that if the standard measures for curing the problem don't work...you do NOT have to get a new water pump. Camco sells a screw on water check valve that you can just put in line to solve the problem for a few bucks.
https://www.homedepot.com/p/Camco-1-...s&locale=en-US