Originally Posted by Hudlow
Open the black tank drain and put a water hose in the appropriate vent on top of the TT.....turn on the water and observe flowage...
Make SURE the hose has a shutoff at YOUR end of the hose!
If the vent fills in only seconds, the vent is blocked. Push the hose down until it stops and try to blast out the obstruction.
If the vent starts filling after only a few minutes, the pipe may have been installed too low in the tank.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW