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.