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 > Fresh water tank oveflow lines will not stop leaking

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Baja Man

Inland Empire, CA

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Posted: 06/24/19 02:49pm Link  |  Quote  |  Print  |  Notify Moderator

First time i used this new to me TH. 2009 Tahoe (MVP) 284 SA. Filled 100 gal freshwater tanks ( 2 serparate 50 gal tanks that fill through one fill location. I filled tanks until water came out overfllow lines. Each tank has one line. These overflow lines are flat flimsy rubber lines, not round plastic / rubber lines. They appear to be mounted at top of tank and simply drape over and hang down to bottom of tank.

Since I left house and while camping, one of these overflow hoses continues to drip water. It will not stop. I thought after a few gallons were used it woiuld stop leaking water.....it has not. After 24 hours, my water tanks and at 1/3 full with not too much use. I’m losing water as I camp!!!


Why is this happening?
Any clues, insight, advice on what to check and how to check?

Thanks!


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Posted: 06/24/19 03:00pm Link  |  Quote  |  Print  |  Notify Moderator

Sounds like the overflow in the tank extends to the bottom of the tank and the tank is siphoning out. If so install a vacuum break.


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Baja Man

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Posted: 06/24/19 03:08pm Link  |  Quote  |  Print  |  Notify Moderator

If siphoning, that woulsd indicate overflow line goes to bottom of tank (inside tank)....???

midnightsadie

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Posted: 06/24/19 04:16pm Link  |  Quote  |  Print  |  Notify Moderator

I don,t think the overflow pipe would go to the bottom of a tank. never seen a overflow that was flat. IF your hooked up to a water source? I,d say your check valve is leaking threw keeping the tanks over full. but I really have no idea whats wrong.

pianotuna

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Posted: 06/24/19 04:49pm Link  |  Quote  |  Print  |  Notify Moderator

Do you have access to the top of the water tank?

If so check the path of the tubes.


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Baja Man

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Posted: 06/24/19 09:14pm Link  |  Quote  |  Print  |  Notify Moderator

Not hooked up to city water.......
No access to top of tank.....
I’m assuming the flat type of hoses coming from top of tanks are oveflow hoses

I’m Puzzled???.....

schlep1967

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Posted: 06/25/19 10:12am Link  |  Quote  |  Print  |  Notify Moderator

Could just be the water expanding as it warms through the day.
Not knowing how the two tanks are plumbed together it is possible that one drains before the other.


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dedmiston

Valencia

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Posted: 06/25/19 12:35pm Link  |  Quote  |  Print  |  Notify Moderator

I used to have the same problem where my vent lines would create a siphon because they were lower than the bottom of the sealed belly. We tried a couple of things with various success.

DISCLAIMER: The kind folks at Giant RV seem to have been dropped on their heads multiple times, so please don't judge me for their solutions with this warranty issue.

Solution Number 1: "Yeah, that happens sometimes with these units. To break the flow of the siphon, just hold the end of your compressor hose against the vent line and give it a couple of short blasts to clear the line."

That worked just OK, but I knew it was a horrible idea to blast air into the tanks and risk bursting them.

Solution Number 2: "We installed shutoff valves on the vent lines for both of your tanks. Make sure you open the valves while you're filling and then shut the valves when you're done. That way the water can't drain out anymore."

This was a pretty bad idea too, plus it was a pain in the butt to crawl down there to mess with the valves before/after filling. I also knew that this really didn't address the poor design of the vents.

Solution Number 3: I quit dealing with Giant RV and hired a mobile tech to install new vent lines that didn't curve or loop and vented the tanks up high instead of down low, the way a vent is supposed to work.

This worked.

I wish I had bailed on Giant RV a lot sooner.


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nayther

Burbank, CA

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Posted: 06/26/19 07:58am Link  |  Quote  |  Print  |  Notify Moderator

dedmiston wrote:

I used to have the same problem where my vent lines would create a siphon because they were lower than the bottom of the sealed belly. We tried a couple of things with various success.

DISCLAIMER: The kind folks at Giant RV seem to have been dropped on their heads multiple times, so please don't judge me for their solutions with this warranty issue.

Solution Number 1: "Yeah, that happens sometimes with these units. To break the flow of the siphon, just hold the end of your compressor hose against the vent line and give it a couple of short blasts to clear the line."

That worked just OK, but I knew it was a horrible idea to blast air into the tanks and risk bursting them.

Solution Number 2: "We installed shutoff valves on the vent lines for both of your tanks. Make sure you open the valves while you're filling and then shut the valves when you're done. That way the water can't drain out anymore."

This was a pretty bad idea too, plus it was a pain in the butt to crawl down there to mess with the valves before/after filling. I also knew that this really didn't address the poor design of the vents.

Solution Number 3: I quit dealing with Giant RV and hired a mobile tech to install new vent lines that didn't curve or loop and vented the tanks up high instead of down low, the way a vent is supposed to work.

This worked.

I wish I had bailed on Giant RV a lot sooner.


I'd bet money it's a siphon like you describe Dave. You'll have to get to the lines above the clorplast and raise them up above the top of the tank, then there can't be a siphon.


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Baja Man

Inland Empire, CA

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Posted: 06/26/19 04:23pm Link  |  Quote  |  Print  |  Notify Moderator

Dripping finally stopped after 1.5 days. I believe I overfilled tanks (filled until water dripped from overflow hoses). I believe once several gallons were used (to below overflow hoses), siphoning/dripping stopped

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