Originally Posted by Wheezy
Thanks Oldman! My unit is a 2014 314BHDS. You are correct that this is the first time I've dumped this or any other trailer, although I've assisted on other camping trips with friends.
Also wanted to note that the gray tank drain seems to be working fine. I didn't dump it but I did remove the dust cap and it was dry as a bone. I didn't want to drain it and then not have anything to "rinse" my hose with after dumping the black tank.
A couple of things:
It is possible that your black tank valve leaked a bit and filled the tube between the valve and the cap; if so this would be limited to a low volume of liquids behind the cap (yuck!).
The blade part of the black tank valve is broken or disconnected from the rod that moves the blade in a out; if so there could be a large volume (the whole black tank) of solids and liquids behind the cap (yuck x#2!).
It would be best to have some kind of tub in place to minimize the possible mess on the ground as you proceed....
For the low volume of liquids, you should be able to hold the hose when you remove the cap so that the small amount of liquid goes into the dump hose, then connect the dump hose, pull the valve to dump the tank as usual.
But for problem #2 (pun intended)you may need to try to get the hose in place to dump your black, then gray, as usual. This could be a very messy job. I have no experience so no good help as to how to minimize the mess.
If it is problem #2 and you get the hose connected and tank dumped, the valve will need to be replaced. So use lots of water and thoroughly
clean the black tank and don't use the black tank again until after the valve is replaced.
That's all I got. Hope it helped.