Pls help - My black tank level is incorrect

The level of the freshwater tank is a good indication of how much has gone into the waste tanks, unless you are bringing large quantities of liquid refreshments aboard.

GMT830 , yes. I guess that is the "best" level indicator. As My wife always says "if we see diamonds floating above the mine, we know the mine is full of diamonds. It is time to empty."

Cody - can you see straight down into the tank looking down the toilet with the valve open?

The fuller the tank the better the dump

Tom/Barb wrote:

dave17352 wrote:
If you use your rig a lot you will pretty much just know when it is getting full. But if nothing else when it gets full you will know when you flush. It is a pretty simple system. It may burp a little when you flush when it is real full. Eventually you will actually see the contents coming up the 3 inch line, hard to miss. Of course you want it to be at least 2/3 full when you dump so there is enough liquid to get rid of all the solids. Keep in mind the worst than can happen is you could end up with a little in the bowl. Not a crisis.

You must not have a flush kit installed.

We hook up the drain hose to the dump station, pull the slide valve for the black tank, allow to empty, then close the slide valve. Then pull the slide valve for the grey tank, allow that water to chase out the black waste in the hose. then close the grey tank valve.

to flush the black tank, we simply hook up a water hose to the flushing fitting and partially fill the black tank then empty again. repeat as required to insure the tanks flushed out.

I do not have a flush valve on my truck camper blank tank but I do have one on my 5th wheel Cardinal. But with either rig I still like to have 2/3 of a blank tank before dumping if possible. It just provides enough volume to push most the contents out. I also clean out with grey water after black water.

By the way thats one cool airplane you have there in your profile website!!!

dave17352 wrote:
If you use your rig a lot you will pretty much just know when it is getting full. But if nothing else when it gets full you will know when you flush. It is a pretty simple system. It may burp a little when you flush when it is real full. Eventually you will actually see the contents coming up the 3 inch line, hard to miss. Of course you want it to be at least 2/3 full when you dump so there is enough liquid to get rid of all the solids. Keep in mind the worst than can happen is you could end up with a little in the bowl. Not a crisis.

You must not have a flush kit installed.

We hook up the drain hose to the dump station, pull the slide valve for the black tank, allow to empty, then close the slide valve. Then pull the slide valve for the grey tank, allow that water to chase out the black waste in the hose. then close the grey tank valve.

to flush the black tank, we simply hook up a water hose to the flushing fitting and partially fill the black tank then empty again. repeat as required to insure the tanks flushed out.

mowermech , We have a Winnebago 24F C . thanks

What type of RV do you have?
The reason for asking is, in many trailers and motorhomes, you can look down the toilet and see the liquid level. that makes it easy to check the level.
In some, that cannot be done due to the height of the toilet above the tank, and sometimes there is even bends in the pipe. In most of those, the toilet will "burp" when flushed, showing the tank is full.
With experience, you will know how long you and your family can go before dumping the tank is needed. For instance, when we were full-timing, I knew that in about a week or 10 days, the tank would be full enough to be dumped. I wanted it to be more than 1/2 full, but not completely full, then I would dump a bucket or two of water down the toilet with the valve open to rinse it. I never checked the gauges, I knew they would lie to me.

There is probably not a rig over 6 months old that does not show 3/4 full. Don't worry about it, the grey tank will fill a long time before the black tank.

If you use your rig a lot you will pretty much just know when it is getting full. But if nothing else when it gets full you will know when you flush. It is a pretty simple system. It may burp a little when you flush when it is real full. Eventually you will actually see the contents coming up the 3 inch line, hard to miss. Of course you want it to be at least 2/3 full when you dump so there is enough liquid to get rid of all the solids. Keep in mind the worst than can happen is you could end up with a little in the bowl. Not a crisis.