Drain Burp

[Cathyann10]

I have a FR Cedar Creek Hathaway and it has 2 gray tanks. while someone was in the shower a large burp noise came from the kitchen faucet... what does that mean?

Thank you
Cathy

[nomad297]

Originally Posted by Cathyann10

a large burp noise came from the kitchen faucet

From the faucet?

Bruce

[nomad297]

If the noise came from the sink, it means your gray tank has filled to the point where the drain from your kitchen is submerged in water in the gray tank.

This has nothing to do with a problem with an air admittance valve, but if you removed the air admittance valve from beneath your kitchen sink (or wherever else it may be for that part of your gray water system), the problem would stop, but that’s not a solution because doing this will allow the smells from your gray tank to escape into your RV. The only solutions are to empty your Gray tank, which is only a temporary solution, or have the drain from your kitchen raised to a higher point within the gray tank, which is the real solution.

Bruce

[rracer5]

Originally Posted by nomad297

If the noise came from the sink, it means your gray tank has filled to the point where the drain from your kitchen is submerged in water in the gray tank.

This has nothing to do with a problem with an air admittance valve, but if you removed the air admittance valve from beneath your kitchen sink (or wherever else it may be for that part of your gray water system), the problem would stop, but that’s not a solution because doing this will allow the smells from your gray tank to escape into your RV. The only solutions are to empty your Gray tank, which is only a temporary solution, or have the drain from your kitchen raised to a higher point within the gray tank, which is the real solution.

Bruce

Or, the vent for the grey water tank was installed too far into the tank (too close to the bottom) therefore, the only way for air to escape is through another drain (sink).

[nomad297]

True. But I would expect the same problem with all drains connected to that tank if that was the case, and I would also expect the shower to stop draining properly.

Bruce

[rracer5]

Originally Posted by nomad297

True. But I would expect the same problem with all drains connected to that tank if that was the case, and I would also expect the shower to stop draining properly.

Bruce

Also, upon second thought, the kitchen sink should have its' own galley tank (grey #2) and unless the two greys are plumbed together (not common in newer 5'ers), one should have no effect on the other.

I agree. The shower would at least drain slow. Not enough detail in OP's post.

[Cathyann10]

I was told both gray tanks are connected. and it is a 2018 FR Cedar Creek Hathaway 36ck2. It is the drain making the noise and only happened a few times. Not really sure if it was full. But we did drain it after that.