Black tank bound up.

Maybe eating too much cheese? It usually gets me fairly bound up.

I take it CG Septic truck hooks up to drain line.opens dump valve and then SUCKS tank contents out.

2 issues....
Drain valve not opening. Otherwise vacuum from truck would suck it dry
High vacuum being used can damage tank....sucks contents out faster then vent line can allow air back in (waste tanks do NOT hold up very well under a vacuum)

Did 'honey wagon get anything out of grey tank?
Grey YES.Black NO---black tank drain valve NOT opening

Will need to open up underbelly and visual inspect drain valve....open it using pliers etc.

The Kunkels wrote:
Our black tank won't pump out. The fellow in the park said he got nothing out. When ya look down the toilet it is not empty. Thanks.

Looks can be deceiving. Get an old broom handle and stick it down to the bottom of the tank to actually measure it. An inch of black water in the bottom can appear as half of a tank when looking down the hole with a flashlight.

The campground has a septic truck that emptys all the tt's. No sewers in the ground.

What do you mean by "pump out"??

Don't you just hook the hose to it and open the valve and gravity takes over??

If you've just left it open the whole time you've been stationary, then it's just full of solids and that's your problem??

With an RV tank, you are supposed to keep the valve closed until it's full, and then open the valve. The liquid in the tank is what moves the solids out.

If your solids are now dry... Well, you'll have to fill it up with water and let is soak for a bit.. Open the valve and see what comes out or not..

It ain't like a home sewer or even a home septic tank...

Good luck!

Mitch

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The tt is stationary. 35' Hornet Keystone.

Very possible your black tank valve is stuck closed or you have a blockage in front of it. Best to call the RV service place and let them do that job. They will tell you if your valve is good and if it is they have a tool that will blast the blockage out. Most of the time it is just a length of PEX with a shut off valve on it.

You could try a bag of ice and drive around while it melts heard that work. I have not tried myself

No mention of your rig, but if it's fairly new, the punch outs for the tank penetrations could still be in the tank and one managed to work it's way into the outlet. The fill it up and drive around will solve this temporarily, but the next time it's empty, beg, borrow or steal a boroscope and have a look around.