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Old 08-04-2015, 11:45 PM   #1
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FRF 2401W - Help Please: Grey water will not drain

Just took delivery of our 2016 2401W FRF MBS yesterday. We are on the road and this evening was our first opportunity to sanitize the system. Here is the challenge. IF the grey holding tank valve is closed the kitchen sink, bathroom sink nor shower will drain....after the water runs for a minute or two...it stops draining (other than running the water to show they would run....less than a half gallon max...during check out demo yesterday, this is the first water of any amount ran. If we release the grey tank holding valve the water in each location immediately begins to drain. We are about 700 miles into a 3+K trip....

Thoughts/solutions? Thank you
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Old 08-05-2015, 02:51 AM   #2
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What's FRF MBS mean?
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Old 08-05-2015, 05:27 AM   #3
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Plugged vent?
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Old 08-05-2015, 05:51 AM   #4
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Are you at a full hook up site?? Or anywhere near a dump station. If so let the water in the grey tanks drain out. Are you 100% positive that the grey tanks were empty. The dealer normally would have run water to test the the system before your PDI and forgot left it running and filled it / them ???? Just a thought.

Also did you fill your fresh water tank?? If so was the pump off?

The shower being the low point will fill first when the tanks are full.

Good Luck hopefully it is something minor.

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Old 08-05-2015, 08:33 AM   #5
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Originally Posted by Oaklevel View Post
Are you at a full hook up site?? Or anywhere near a dump station. If so let the water in the grey tanks drain out. Are you 100% positive that the grey tanks were empty. The dealer normally would have run water to test the the system before your PDI and forgot left it running and filled it / them ???? Just a thought.

Also did you fill your fresh water tank?? If so was the pump off?

The shower being the low point will fill first when the tanks are full.

Good Luck hopefully it is something minor.

Thank you for the thoughts and suggestions. FRF = Forest River Forester which is a motorhome on Mercedes Benz Chassis.

1. We are a camp with a sewer hookup. That is how we learned that as soon as we released the the holding tank valve all would drain normally. As soo as we close it, it stops (within a gallon or so...or my estimation of what it would take to fill the pipe....no way in the world the holding tank is full. We did this several times.

2. Oddly enough, the shower would not drain the shower water, but the VERY little backup (other than the running water in the kitchen staying in kitchen sink (etc), was it appeared a little would back up from kitchen into bathroom

3. I believe the pump was off when the fresh water tank was filled....definitely was not running water. Not sure I understand what this could have had to do with it?

I can not think of better words to describe it...but when the grey holding holding tank valve was closed (preventing from draining straight to camp sewer) and the sinks and shower were backing up with their own running water, every once in awhile we would hear a 5 second or so gurgling sound...something like when we have at something that did not here something and your intestines make a prolonged gurgling sound.....
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Old 08-05-2015, 12:54 PM   #6
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Sounds like a clogged vent.
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Old 08-05-2015, 01:39 PM   #7
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Quote:
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Sounds like a clogged vent.
x2
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Old 08-05-2015, 03:04 PM   #8
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Quote:
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Sounds like a clogged vent.
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Old 08-05-2015, 03:34 PM   #9
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Opening the grey valve is allowing air in, which is needed for drainage. Air has to displace the water. Air has to escape to make room for more water. Normally the vent allows for this. This is why others are suggesting the vent is clogged. It's not uncommon on brand new RV's for construction debris to block a vent.
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Old 08-05-2015, 07:49 PM   #10
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I had a drain problem and discovered a piece of linoleum that was thrown in there when was being built. Others on this forum in the past have reported all kinds of debris in these tanks and that could also be the source of the vent problem. One other possibility that happened to a friend was a vent pipe that was installed too far into the tank and it was covered by water and would not allow air into the tank.
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