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Old 03-10-2013, 01:12 PM   #1
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Before I bust the fresh water tank

Hi

I just installed the CV as per Takepride's post from a few years back. I have tried to fill up the water tank. The monitor says it is full and I have kept the water coming for about another 5 mins and it hasn't overflowed yet. Where exactly is the rear overflow? Where is the water tank? I would like to see if I can see if it is full visually. I just don't want to bust the tank from overfilling! Anything else I should be looking for?

Thanks
Geoff

2000 38 FDS
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Old 03-10-2013, 01:23 PM   #2
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Quote:
Originally Posted by alpinedrvr View Post
Hi

I just installed the CV as per Takepride's post from a few years back. I have tried to fill up the water tank. The monitor says it is full and I have kept the water coming for about another 5 mins and it hasn't overflowed yet. Where exactly is the rear overflow? Where is the water tank? I would like to see if I can see if it is full visually. I just don't want to bust the tank from overfilling! Anything else I should be looking for?
Thanks
Geoff
2000 38 FDS
What [moderator edit] is a CV?
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Old 03-10-2013, 01:24 PM   #3
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FWIW - I have actually left the coach with the control valve in the "Fill" position and my custom front vent valve closed. I came back to discover water running all over the ground. I was concerned that I had damaged the tan. I could see water dripping out behind the service bay area. Upon closer inspection I realized that the water was pouring out of the rear vent tube on the water tank. Nothing was damaged. I would think that as long as the water pressure isn't greater than the maximum system rating (about 65 psi.), no breakage will occur. The key is to ALWAYS employ a water pressure regulator unless you know what your source is rated.
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Old 03-10-2013, 01:27 PM   #4
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Quote:
Originally Posted by alpinedrvr View Post
Hi

I just installed the CV as per Takepride's post from a few years back. I have tried to fill up the water tank. The monitor says it is full and I have kept the water coming for about another 5 mins and it hasn't overflowed yet. Where exactly is the rear overflow? Where is the water tank? I would like to see if I can see if it is full visually. I just don't want to bust the tank from overfilling! Anything else I should be looking for?
Thanks
Geoff
2000 38 FDS
alpinedrvr
What [mod edit] is a CV?
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Old 03-10-2013, 01:34 PM   #5
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Hi Bob

Thanks for the reply. I do have a pressure regulator on so I will try again to fill to overflow!

Mel A CV is a check valve [moderator edit]

Geoff
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Old 03-10-2013, 02:31 PM   #6
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Hi Bob
CV is a check valve [moderator edit]
Geoff
Goeff
Thanks
I meant WTH....(aka; What The HECK)
Sorry
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Old 03-10-2013, 03:45 PM   #7
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Hi

I continued to fill my water tank until the water came out the rear overfill by the sanitation bay. The water continued to siphon for about 20 minutes so the problem has gone from the front overfill to the rear one. what now??

Geoff
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Old 03-10-2013, 04:29 PM   #8
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Assuming (I know ) your '00 is the same as our '99 only 2 feet longer just open the side doors under the slide and watch the tank fill. I use a flashlight to highlight the water (hold light under tank shining up) you'll see how full it is just shut it off right below full.

Another way would be to install a vacuum breaker on the rear overflow. This will prevent siphoning and still allow the overflow/vent functions to work properly.

I installed a ball valve, pretty simple (as of now, no telling after I age more) to open it while filling then close it after full.

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Old 03-10-2013, 05:29 PM   #9
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Dont think I would depend on water pressure of less than 65 psi to protect my fresh water tank. The design of the tank is rectangular with a lot of flat sides between seams. That adds up to a lot of square inches to have 65 lbs pushing against. Cheap, plastic/pvc check valves from Lowes should curb the siphon issue but I wouldnt want to have one or both vent lines blocked and hope my tank can withstand 65 psi. Guess vacuum brakers might work but it seems like they have to installed well above the level of tank in order to "break" the vacuum in question--not much room/access in our Alpine basements to accommodate this.
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Old 03-10-2013, 06:44 PM   #10
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Hi Dave

I checked my doors under the slide and I do see the tank ; however it is between the 2 chassis rails and except if I crawl into the bin with the tray (after emptying everything!) I can't see the top of the tank. My thought now is to leave the CV on the front and install a shutoff like you have on the rear overfill as it is easy to access and then fill until it flows out the rear and then let it siphon for a minute or 2 then shut it off. If I forget to open it for the next fill I hope the front CV will open at 5 psi and relief the pressure there! BTW is your shutoff on the front or rear overfill?

Geoff

Old Scout thanks for your thoughts as well. I don't think that if I let the water siphon for a couple of minutes that the pressure will build up. After I shut off the water fill and use the fresh water pump the tank will be emptying and not building up pressure. I'm no engineer or plumber or expert of any kind so if I am wrong let me know! BTW Did you get my phone message today. Thanks again

Geoff
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Old 03-10-2013, 07:09 PM   #11
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Geoff, the only problem I can see with a shutoff on the vent that dumps in back is with the check valve in front and the shutoff closed the tank may not be able to draw air in when the pump supplies water to the coach, real issue arises if that happens. You'd have to be sure to open it every time you stopped.

My valve is in front, our main problem in addition to siphoning if filled all the way was losing water on the steep downhills we often travel. I didn't want to go with a check valve as the ball valve makes draining all the water out of the vent line for winterizing very easy.
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The above post is just my experience/opinion which is worth exactly what you paid for it.

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Old 03-10-2013, 08:49 PM   #12
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Yes ,yes,yes, Dave I had not thought of that at all. I kept thinking of the city water pressure as I was filling and not the air needed as the water pump is pumping out of the tank. Hmmmmmm I'll do some more thinking (which is dangerous!)

Geoff
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Old 03-11-2013, 12:09 AM   #13
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Geoff,

Here are a couple of thoughts for you from my experience.

We've got a 34 footer with the 100 gallon fresh water tank between the frame rails in the basement also. I measured the tank height and then marked off 1/4 of the way and wrote 25 (gallons) and 1/2 of the way and wrote 50, etc. I can't see the 3/4 point or the 100% point as they are behind some steel framework. But, I can time it to 1/4 and to 1/2 and then I double that and hope that I am somewhere close to 100%.

The second idea is to replace your water level gauges with something more sophisticated. Our factory gauges had LED lights for each 1/4 (or maybe it was 1/3) tank. So, if it said 2/3, all you really knew was that you were less than full but more than 66 gallons (assuming they were working exactly). Look online at the SeeLevel Gauges at SeeLeveL RV Gauges by Garnet Technologies Inc.
They measure in gallons and digitally read each gallon, i.e. 54, 55, 56 gallons. This gives me a much better gauge of how much water I've got left vs. only knowing to the nearest 'third' (or quarter, I can't remember which came from the factory).

Good luck!
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Old 03-11-2013, 09:30 AM   #14
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Sounds like putting a valve on the overflow is dangerous, I wouldn't do it. I have installed the SeeLevel II on all my tanks and it is way better than the old one. It measures percentage full from 0 to 100%, not actual gallons.
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