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Old 04-30-2013, 01:34 AM   #1
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Fresh Water Tank Leak At Bottom of Tank From 1/8" Hole

We purchased a 2008 Classic 25FB about a month ago. This weekend we were out for 3 days to Missouri. The water tank was about 3/4 full on the drive up. The campground has no water hook ups so we filled the water tank full before setting up camp. The weekend was rainy and damp at first so the parking spur was wet until Sunday. By Sunday the weather go better and dried up. I noticed a water had been been slowly leaking under the AS water tank. I could seem a drip forming in the middle center of the tank. I crawled underneath the AS from the behind the tires up to the tank. The tank bottom is rippled and not smooth, I guess to provide more strength. As I crawled under the AS I reached the rear edge of the water tank and notice what looked like a 1/8" diameter hole in the plastic. They didn't look like it was intentionally drilled. As I scooted toward the leak I discovered an identical hole where the leak was. Dead center of the tank in the center of on of the inward ripples. The tanks was not very full at this time. I was able to wipe the water off and within several seconds another drip started to develop. If I pounded the bottom of the tank it water would spray out the hole.

I didn't check the rest of the tank for these 1/8" holes. Any idea what these are? Maybe caused when the tank was manufactured?

During the the dealer PDI the water tank had been filled and I didn't notice any leaks. About a week later we took a short overnight to a local state park. The water tank was partially full and I didn't notice a leak.

I have a 90 day dealer RV warranty with this AS. This 3 day trip provide a list or other major problems.

Kelvin
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Old 04-30-2013, 04:58 AM   #2
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1/8" is about the size of a hole for a pop rivet...

I would call the dealer's attention to it and have it repaired under warranty.

Aaron
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Old 04-30-2013, 10:16 AM   #3
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I'm guessing it's about 1/8" but looks like the right size. Why would the holes be there? where they going to rivet something through the tank?

Could these holes be plugged up and sealed forever with some time of material that would fuse the hole shut without affecting the potability of the water?

Kelvin
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Old 04-30-2013, 11:10 AM   #4
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Kelvin,

This photo is of our FW tank in the area of the low point petcock drains and FW drain. Your Classic should be the same. As you can see the FW tank is protected be a metal pan covering the entire tank.

Are you sure the holes you seeing are the metal tank?

Bob
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Old 04-30-2013, 11:27 AM   #5
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My hole is at the center line of the trailer. The tank is "plastic". The bottom is shaped

|__|--|__|--|__|--|__|

The hole is in the center channel and it sags a bit there. There are three metal support straps that run fore to aft but the bottom of the tank runs cross ways to the the ridges. They could've used 4 straps. Sorry the trailer is in storage and I didn't take any photos. It must just be a small pinhole that has developed over the years.

Kelvin
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Old 04-30-2013, 03:01 PM   #6
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I found this thread. One suggestion is to us JB Water Weld which is non toxic. With such a small hole it should work well and not need reinforcing but I could still do that also.

http://www.airforums.com/forums/f443...elp-51003.html
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Old 04-30-2013, 06:32 PM   #7
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Originally Posted by KJRitchie View Post
I'm guessing it's about 1/8" but looks like the right size. Why would the holes be there? where they going to rivet something through the tank?

Could these holes be plugged up and sealed forever with some time of material that would fuse the hole shut without affecting the potability of the water?

Kelvin
Somebody screwed up. I have an extension ladder at work that I red tagged because somebody cut partway through the side rail with a circular saw...apparently they were using it as a sawhorse.

Plenty of plastic welding choices out there and some epoxies that should work.

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Old 04-30-2013, 07:11 PM   #8
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Which of the Airstream models no longer use the metal tank pan for protection, thought they all still used them.

Bob
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Old 04-30-2013, 07:50 PM   #9
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Is it just a drain hole for the pan protector?

Could some rain water or road water gotten in there on the drive and it was just slowly draining out?
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Old 05-01-2013, 06:44 AM   #10
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What I'm seeing strapped up from underneath the AS what looks like a plastic type holding tank. Do they put the tank in a plastic shell then raise it up and strap it up and what I'm seeing is water dripping out that accumulated between the tank and pan? What is the water tank made of?

I have a water leak inside from the flexible output hose from the water pump. The hose makes a loop then attaches to the PEX plumbing. At the point of the leak the plumbing is angled down so water could run down on the PEX pipe that goes down into the cavity below the plywood subfloor to route to the kitchen. For several nights the water pump would burb every hour. I had check for leaks earlier and couldn't find one. I just figured it was normal pump activity.

This would be marvelous if this was just a plastic pan cover that had a little water in it resulting from the water pump leak above.

Thanks

Kelvin
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Old 05-01-2013, 07:35 AM   #11
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Kelvin,

I'm not aware of any FW tank install's that haven't used a pan to protect the tanks. Ours is metal, but later models may very well be plastic.

Members with 2008 & up models will have to confirm.

Our's leaked from the access panel you see in my previous post #4. Turned out it was the vent tube where it connects at the tank, the clamp was left loose at install.

Bob
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Old 05-01-2013, 11:50 PM   #12
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I downloaded the 2008 Classic Parts book and in the fresh water section these parts showed

601863-01 TANK, FRESH WATER 39 GALLON
601642 PAN, TANK ROTOCAST
453493 HANGER STRAP, TANK PAN
601243 DRAIN COCK, FRESH WATER
600155 PLUG, CLEANOUT 1-1/2
453615 TANK SUPPORT STRIP-61.50" SAFA

Looks like there is a pan made of Rotocast. This must be the plastic I'm seeing under the AS.

I don't think there is an issue now.

Kelvin
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Old 05-02-2013, 05:28 AM   #13
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Quote:
Originally Posted by KJRitchie View Post
I downloaded the 2008 Classic Parts book and in the fresh water section these parts showed

601863-01 TANK, FRESH WATER 39 GALLON
601642 PAN, TANK ROTOCAST
453493 HANGER STRAP, TANK PAN
601243 DRAIN COCK, FRESH WATER
600155 PLUG, CLEANOUT 1-1/2
453615 TANK SUPPORT STRIP-61.50" SAFA

Looks like there is a pan made of Rotocast. This must be the plastic I'm seeing under the AS.

I don't think there is an issue now.


Kelvin
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Old 05-02-2013, 09:07 AM   #14
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To confirm I contacted Airstream yesterday and they called me back this morning. Yes, at least on the Classic there is a Rotocast shell for the water tank. The tank rests on styrofoam. These are just drain holes. Must have been the water from my leaking water pump hose.

Thanks for everyone's comments

Kelvin
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Old 06-07-2013, 04:34 PM   #15
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Well - I'm cornfused once again. I filled the FW tank at out last campground last weekend. The monitor showed the tank as 100% full. Stored it for the week and traveled up to Maine today at a boondocking site - no water hookups (thus the fill of the FW tank last weekend). Get in, set up, turn on monitor and FW tank is 50% full! :huh?:

The drain valve is closed and not dripping. Since its raining, I can't see if anything else is leaking.

Insights/suggestions welcome! Good news is the bathrooms and showers are a quick walk from our site so if we lose all our FW, we can still function with the key necessities! :-)

At the end of the day, I'm still camping in the airstream and that's better than any alternative :-)
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Old 06-07-2013, 04:51 PM   #16
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Steve,

Did you fill to the monitor or wait 'til water came out the vent?
The slower I fill the fuller I get.

Maybe it was only 1/2 to start. When our panel 'sez full I can get a LOT more in.

Bob
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Old 06-07-2013, 07:59 PM   #17
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I filled til it came back out the full tube THEN I looked at the monitor and it said it was full. :huh?: :-/

Still having a great time! :-)
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Old 06-15-2013, 04:24 PM   #18
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Before heading to the scales today I filled my FW tank to the point of overflowing. I kept overfilling it because I wanted to be sure it wasn't just a bubble. Satisfied it was completely full, I used the meter inside to confirm 100% full FW (and nearly empty black and gray tanks as expected since we dumped tanks on our last trip).

Within 2-3 hours, the FW tank gauge read 50% when I put the trailer back in storage. Same level as when I filled on leaving a campground in preparation for a boondocking trip the following week.

Drain valve is closed. There must be a hole halfway up from the bottom of the tank somewhere.... Gonna have to talk with the dealer while still under warranty.
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Old 06-16-2013, 06:28 AM   #19
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If you do have a leak all that water must be going somewhere. There is no evidence of visible leaking under the trailer, like staining? Do the the gray and black tanks still show empty after the water tank shows 50%. Does the loss of water only happen when you are towing? If you park and fill the tank does it still show 50% after being stationery for 2-3 hours? Your water pump is off? Does it burp or come on intermittently indicating a water leak somewhere? Is there any evidence of water leaking under the hot water tank?

Kelvin
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Old 06-16-2013, 06:50 AM   #20
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Originally Posted by KJRitchie
If you do have a leak all that water must be going somewhere. There is no evidence of visible leaking under the trailer, like staining? Do the the gray and black tanks still show empty after the water tank shows 50%. Does the loss of water only happen when you are towing? If you park and fill the tank does it still show 50% after being stationery for 2-3 hours? Your water pump is off? Does it burp or come on intermittently indicating a water leak somewhere? Is there any evidence of water leaking under the hot water tank?

Kelvin
We didn't notice any evidence last time as it was probably drained by the time we got to the storage lot. This time, I'm guessing most of it drained on the way to the scales.

Black/gray remain empty according to the meter.

I will have to fill and check while parked.

Water pump was off while parked in storage and while towing. No burping or intermittent turning on when boondocking last week but by the time we set up, we were at 50% already. I could test that too. Fill up, park with the pump on and see if I hear anything or see dripping underneath.

Not aware of anything with the hot water heater but will keep an eye out there too. Thanks for the ideas!
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