Black tank flush problem

[CaveDiver86]

I have the 345 BHTS and have 2 bathrooms with 2 black water tanks. Each tank has their own flush..
The main bathroom tank flush works great but the back bathroom black tank flush does not work at all. No water goes in the line or tank. ..

Is there a check valve that may be installed backward? If so where is it??.. I have it all inclosed underneath. Dealer is a POS that gave me the worst PDI prep ever.. This is just one of several things wrong with it. .. I fulltime so droping it at dealer is not an option.

[CaveDiver86]

Ok after much googleing I see yes there is a check valve and of course yes it is backwards...
All the hoses are crimped on so not sure how to fix that... really not liking the pattern here.

[Sledgehammer]

If you wanted to fix it yourself, lowes and home depot sell the crimps and crimp tool, or you could cut the tubing a few inches away from the check valve on each side, and put it back together with the Sharkbite/ Gatorgrip fittings for pex pipe.

[cgbrooks]

I have the 36FBTS with half bath, one black flush connection on unit, only appears to flush the half bath tank. Have not figured it out yet. Dealer no help whatsoever.

[jayfowler]

Cgbrooks - There is one black tank flush inside the utility compartment just above where you connect your hose for fresh water. The second black tank flush is on the outside exterior wall just above the furnace vent.

[cgbrooks]

Jayfowler, thanks for the info, I will try that one. The dealer told me that one was for winterizing the plumbing system. If it was black it would have been evident what it was for.

[cgbrooks]

UPDATE: I connected to the port suggested by jayflower,(which should be colored black but isn't, nor is it labeled) closed drain, waited by monitor panel, Eureka, lights lit after a few minutes, another Jayco mystery solved by the forum. I have learned more by trial and error and this forum than all the info provided by the PDI tech at Camping World. Thank you very much.