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Old 11-23-2018, 05:21 PM   #1
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Fresh Water Tank overflow drain

I haven’t filled my fresh water tank.
I hook my city water line up.
Within 30-45 minutes water starts coming out of my fresh water tank overflow drain (which is located next to my fresh water tank low point valve)
I’m assuming the only way this can happen is that my city water is flowing into my fresh water tank through my fresh water pump.

1) How does that happen? (Is there a faulty one way “valve” somewhere in or near my fresh water pump)
2) How do I fix this?
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Old 11-23-2018, 05:34 PM   #2
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Quote:
Originally Posted by Bunkie View Post
I haven’t filled my fresh water tank.
I hook my city water line up.
Within 30-45 minutes water starts coming out of my fresh water tank overflow drain (which is located next to my fresh water tank low point valve)
I’m assuming the only way this can happen is that my city water is flowing into my fresh water tank through my fresh water pump.

1) How does that happen? (Is there a faulty one way “valve” somewhere in or near my fresh water pump)
2) How do I fix this?
This situation is reported about 11 times per week. You could probably look in the Plumbing and Water Systems & Fixtures - Forest River Forums sub-forum and find several occurrences this month. I did a search and found at least this one ==> Fresh water tank. Execute the procedure listed herein and see if it doesn't help. If it doesn't, do a Search for "check valve" and read other options.
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Old 11-23-2018, 05:40 PM   #3
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There is a check valve in the water pump. The water pressure from the city water line is pushing this open to let water into the freshwater tank and over flowing it. Shut city water off and for now use water out of water tank.



1) Do you have a water pressure reducer on a hose from the city water to the RV..... A BiG must, as all campground and city water pressures can be very high and blow out your RV water lines....


2) There also may be some type of debris at the RV water pump check valve and keeping it slightly open. Shut city water off and use the water pump and pump water out of the fresh water tank. This may flush out the debris. If it does not flush it out, you may have to remove the check valve and clean it out..
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Old 11-23-2018, 06:08 PM   #4
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Or you can buy one of these (see photos below) at Camping World or any other RV parts supplier for $10-$15 bucks and put it on in 5 minutes without any tools and be done with it forever!

And I'm a non-handyman and I did this one myself!

Get the brass one...you won't regret it!
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Old 11-23-2018, 06:17 PM   #5
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Quote:
Originally Posted by Bunkie View Post
I haven’t filled my fresh water tank.
I hook my city water line up.
Within 30-45 minutes water starts coming out of my fresh water tank overflow drain (which is located next to my fresh water tank low point valve)
I’m assuming the only way this can happen is that my city water is flowing into my fresh water tank through my fresh water pump.

1) How does that happen? (Is there a faulty one way “valve” somewhere in or near my fresh water pump)
2) How do I fix this?
Welcome to the forum.

You don't really have a "Fresh water tank low point valve".
You have a FW tank drain and a "FW tank overflow/vent"

Somewhere under your rig are "2 low point drains". Red (hot) one Blue (cold)
They drain the water piping only.
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Old 11-25-2018, 07:36 AM   #6
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I wished I had a dollar for every post that comes up with this problem? I could go and buy a 24 packI think this has got to be the 10th this week
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