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Old 05-27-2020, 07:41 PM   #1
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How to drain the Freshwater water tank?

I’m completely stumped. How in the world do you drain the fresh water tank on Allegro Bay 34xb? Opening the valve caused a very slow stream to come out and then stopped draining altogether. It was 2/3rds full! I must really be missing something obvious. After sanitizing I needed to drain it. I ended up pumping it all in to the gray tank and on to the ground with the outdoor shower using the 12 volt pump.
Any help is greatly appreciated. I keep finding one mystery after another on this RV. The manual is useless for providing any actual details.
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Old 05-27-2020, 08:42 PM   #2
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I suspect bugs or rodents have built a nest in the drain line, can you use low-pressure compressed air up the line to check? You might open a top inspection plug in the tank first, as these tank are not designed for pressure.
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Old 05-27-2020, 08:50 PM   #3
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Make sure your vents aren’t plugged if that’s possible on your model
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Old 05-30-2020, 05:45 PM   #4
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Which vents?
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Old 05-31-2020, 07:18 AM   #5
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Don’t know where it is on your coach but the fresh water tank is vented. The black and gray as well. Those come out on top of the coach and suspect the fresh water will also
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Old 05-31-2020, 07:56 AM   #6
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Quote:
Originally Posted by Ray,IN View Post
I suspect bugs or rodents have built a nest in the drain line, can you use low-pressure compressed air up the line to check? You might open a top inspection plug in the tank first, as these tank are not designed for pressure.
Not familiar with your RV but I was thinking along the lines of Ray’s post. When winterizing with air hooking up air line to the water fill connection to blow out the lines, with just the fresh water drain open would the air force the water out?
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Old 05-31-2020, 11:15 AM   #7
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I suspect that the drain valve itself is either defective or has debris in it. It’s not unusual to find construction debris in the tanks from drilling holes etc in the tanks. With the valve open, insert a snake or something similar up into the drain.
You are opening the main tank valve which should be about in the middle of the rear of the wet bay and not one of the low point valves..? Tiffins usually have a fairly large blue handle on the wet bay drain. It’s usually on 3/4” PVC.
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Old 05-31-2020, 01:19 PM   #8
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This may not translate to your Tiffin but I believe the only vent on my Monaco's freshwater tank is the overflow fitting and drain line that tells me the tank is full when I'm filling it. If I was having the symptoms you describe that vent line is the first thing I would check.
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Old 06-01-2020, 05:23 PM   #9
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How to drain fresh water tank

Haven't been on the roof yet to look for vents and don't see anything but what's in these pics I just took. if there's another drain valve i'm missing I don't know where it would be.
Here's some pics of what I see.
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Old 06-01-2020, 06:34 PM   #10
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See the tank drain on the right side. The tank has to be vented or it would air lock and not fill. As mentioned it may be the overflow line on the top of the tank that goes down and out of the wet bay area on mine. Believe its a 1/2 inch Pex. Try to overfill it from the autofill function. If it will be not fill completely and you don’t see any water comingout that may be the issue. Also I have gone to Home Depot and bought a resettable meter for about $10 that goes onto the water hose that I find very handy for checking my calibration
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Old 06-01-2020, 10:46 PM   #11
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The closeup(3rd pic) of your water pump and 3 drain lines shows they are clearly labeled. The tank drain valve is behind the white water line to the water pump. The other 2 valves are for draining your hot and cold water lines.
Here is a pic of my 40 gallon black tank (left) and my 60 gallon grey tank(right.) Both are sitting on top of my 100 gallon fresh water tank. This pic is of the passeger side opposite the water bay on the driver's side.
The fresh water overflow (and vent) fitting is the square 90° fitting on the top rear corner of the tank. It connects to another 90° fitting which is connected to an unvalved rubber line which drains excess water on to the ground in front of the curbside drive wheels. If that line gets plugged or pinched it would prevent air from replacing water removed from the fresh water tank.Click image for larger version

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Old 06-02-2020, 08:04 AM   #12
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Your setup is different than both our Tiffins. The vent for your water tank on most Tiffins is on the PS side of the MH. It should be near the rear wheels. If you have the manual fill port, the vent is located behind that door. It’s pretty small and could be blocked. The drain valve on yours is pretty small and could easily be blocked. From what I see, your drain is the valve on the far right.
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Old 06-02-2020, 09:09 AM   #13
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I had this happen and it turned out to be mold in the tank that clogged my drain I got a circular wire brush that was the size of the pipe and cleaned it out. Worked like a charm.
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Old 06-04-2020, 04:36 PM   #14
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When I first opened the valve it was draining water but slowly got less and less flow, then stopped altogether. So, it seems like it's not clogged. I guess i'll ask the mechanic next week when I have it in for a few other items.
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