Black tank flush system leaking clean water

[Cmad34]

Hey everyone. First time trailer owner here. We took our brand new Outback 302UBH camping last week. When I connected to complete my black tank flush, I noticed some water flowing through the dump hose but then CLEAN water began pouring from multiple places from the bottom of the trailer. It seems to me their is a bad hose or connection between the hose connection and the black tank itself but I really don't understand the mechanics of it all and nothing is visibly accessible. Am I doing something wrong or is this an obvious manufacturing problem? Thanks!

[sourdough]

Sounds like you probably have a malfunctioning anti siphon valve, probably under the bathroom sink. Read the thread in the link and see if it helps;

https://www.keystoneforums.com/forum...ad.php?t=50876

[JRTJH]

Here's a "block diagram" of the black tank flush system.

It may help you understand what's in the system (nothing for a few elbows, a anti-siphon valve, a spray head and a hose connector on the side of the trailer)...

It's a simple concept and the most UNRELIABLE part of the entire system is the anti-siphon valve... You'll grow to either "hate it, endure it or replace it".....

[Ribtip]

Originally Posted by Cmad34

Hey everyone. First time trailer owner here. We took our brand new Outback 302UBH camping last week. When I connected to complete my black tank flush, I noticed some water flowing through the dump hose but then CLEAN water began pouring from multiple places from the bottom of the trailer. It seems to me their is a bad hose or connection between the hose connection and the black tank itself but I really don't understand the mechanics of it all and nothing is visibly accessible. Am I doing something wrong or is this an obvious manufacturing problem? Thanks!

If you don't see water in your camper under the bathroom sink or all over the floor. The problem is most likely the connection to the black tank itself. Or the plumbing after the anti siphon under the camper