Water blockage.

[Kev and Christa]

I have an Autotrail Apache 634U 2008. After using approx 25 ltrs of water the sink, shower or bathroom pipes seem to back up. If I drain the exterior grey water tap the blockage is released. I have tried soda crystals which have had no effect. Is it possible to have an air block in the drainage system which might cause water to back up. I am in my way back from Germany at the moment so limited to what i can do. Any ideas would be appreciated.
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[Two on Tour]

Sounds like you have got a blocked breather on your grey tank so the pressure builds up stopping the water flowing away until release the pressure when you open the drain valve.

 

[tonka]

Never heard of an air block and had several Autotrails..
Only had that happen once and it was some crud blocking the outlet.. Best get home and see if you can clear it out, drain unblocker maybe also there should be a very large screw cap on the bottom, take that out and see how much rubbish is there.

 

[Kev and Christa]

Do you have any idea where the breather might be located.

 

[Two on Tour]

Best thing to do at present is to leave the grey waste valve open with a bucket under it and empty the bucket as nesassary.

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[Kev and Christa]

Yes im already doing that its just becoming a pain to empty at the moment.

 

[tonyidle]

Do you have any idea where the breather might be located.

It will be close to the top of the tank.

 

[Kev and Christa]

Cheers will have a look later. We're out at the moment.