Kitchen sink blocked

Question

Kitchen sink won't drain. Pipes under sink removed, all clear. Snake used by rv tech did no good. Went out 24 feetonly takes about a quart or so of water to back up into sink. But are clear out much further.
Help. Any tdeas?
Thank you,
J.D.

donn0128 · Answer

Empty the gray water tank.How many gray water tanks do you have?

takingthe5th · Answer

You might have an air lock. Do you have an air admittance valve that might be defective? Is the roof vent open and clear?

A quick test-while the sink is not emptying, pull the dump valve. If it’s an air lock the sink should start flowing.

newman_fulltime · Answer

find the other grey tank valve and open it

lwiddis · Answer

Might be good to identify your RV make, model and year.

ladyrver · Answer

I had a Montana which had the galley tank drain behind the rear street side tire.  Did not know it for 3 months.  (Can you tell how much I cook/wash dishes?)  Does your monitor panel show a galley tank reading?

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Kitchen sink blocked

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