gurgling when draining the grey tank

[jbagnall]

Hello-

This has been something I have noticed for the last 5-10 trips or so, and I kinda want to get to the bottom of it at this point.

I'm hooked up to a seasonal site with a sewer.

I drain the black, no problem.
I then drain the grey, and then the sewer stops draining, and I hear lots of gurgling when I'm sitting next to the sewer. I have to let it sit for about 30 minutes for the sewer to drain, and then I can continue dumping and hope it doesn't happen again. I've found some success by only half opening the valves and letting it slowly go down the sewer instead of the normal gush that it's capable of doing.

I've had sewer problems in the past and the CG has messed around with it. It could just be that, or maybe it's something with my camper that is causing the sewer to drain slowly?

I have done some searching, and I will check my vent cap for debris next time we're camping. Other than that - other ideas on what to check?

Thanks!

[craigav]

Check for an "air admittance" valve under the sink area and make sure it is not stuck closed. ~CA

[RogerR]

Do you have a roof vent for the tank? If not than x2 on the Studor type vent under the sink or somewhere. Google Studor vent. Basically, it allows air in to the tank, but is made to not let stinky air back out.

[jbagnall]

I'm pretty sure I have a roof vent, but I'll get up there next trip.

Appreciate the tip on the other valve -- wasn't familiar with that. Will check that as well.

Thanks.

[jbagnall]

Reviving an old thread of something I didn't get around to last season. I'm not at my camper, and would like to have a replacement AAV for our next trip. Does anyone know which kind I need for my 2018 19H?

Looking on Amazon, seems like the Studor ones are pretty popular. But do I do ABS or Plastic? Do I do the mini-vent or the redi-vent?

I'm not too familiar with these - any help would be great - thanks!

[us71na]

Originally Posted by jbagnall

Looking on Amazon, seems like the Studor ones are pretty popular. But do I do ABS or Plastic? Do I do the mini-vent or the redi-vent?

I'm not too familiar with these - any help would be great - thanks!

ABS (black) and PVC (white) are both plastic, just different types. The solvents for gluing are different, but if the connection is threaded it doesn't matter.

[RogerR]

take some pictues, go to lowes home, ace, menards to get ID and help may also be printing on pipe on back

[jbagnall]

Thanks all. I found it under the bathroom sink. 1.5" threaded ABS for those with a similar camper that stumble across this thread.

Will get a new one later today. Is there likely only one AAV in the entire camper or is there possibly another one under the kitchen sink?

[DNelson]

All of the responses are based upon the flow from the RV being a problem.

To me your comment "I then drain the grey, and then the sewer stops draining" sounds like you are describing the RV parks sewer being a problem. Is the problem flow from your RV piping or the RV parks sewer system not accepting the flow from your piping? If it is actually a problem with the RV park there isn't much you can do. I suspect they have a partial sewer blockage.

If it a problem with your RV pipes then the other people's responses are probably right on.

[jbagnall]

I brought out a couple of vents that I got from Home Depot and they were all too tall and hitting the underside of the counter top and I didn't feel like cutting the ABS and dealing with that.

So a new vent that is the exact model is on order. The current one has a rattling sound when I shake it - not sure if that's normal or not.

I'm pretty sure at the end of the day it's going to be a CG sewer issue like DNelson pointed out. But, we'll see next trip I get out there.

[JB13502]

Originally Posted by jbagnall

IThe current one has a rattling sound when I shake it - not sure if that's normal or not.

Most likely the normal sound of the valve opening/closing from your shaking it.