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Old 05-10-2021, 05:32 PM   #1
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Black Tank Flush Connector Leak

I have a leak between my black tank and the flush line connector. Does anyone know how the actual connector the elbow is connected to secures to the tank itself? How would I go about replacing or repairing it?
Thanks!
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Old 05-11-2021, 06:45 AM   #2
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If you look close you'll see that the elbow is threaded into the nozzle that's welded into the tank. If you cut the metal band off the hose and remove the hose you can unscrew the elbow and reseal or replace it. Hopefully it's the elbow and not the nozzle neck that's leaking.
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Old 05-11-2021, 09:44 AM   #3
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Thanks for your reply!
Unfortunately, it appears that it's leaking at the junction between the tank and the connector itself and not the elbow. I guess I'll need to disconnect the elbow and hose and see if there is anyway to tighten or seal the connector to the tank.
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Old 05-11-2021, 10:16 AM   #4
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Those nozzles are spun welded into the tank. If it is leaking there it may be possible to hole saw the nozzle out and use a bulkhead fitting in it's place. The other option is to 'weld' the nozzle with a plastic welder kit.

I've seen a few suggestions for plastic repair kits, but I don't have any experience with those.
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Old 05-11-2021, 10:35 AM   #5
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I'll take a closer look at everthing in the next few days and see get a better idea of which options you suggest might work the best.
Thanks again for your expertise!
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Old 05-11-2021, 12:44 PM   #6
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Quote:
Originally Posted by Wolkstyx1 View Post
I have a leak between my black tank and the flush line connector. Does anyone know how the actual connector the elbow is connected to secures to the tank itself? How would I go about replacing or repairing it?
Thanks!

Dry the area thoroughly, scuff it up with some sandpaper, clean it with alcohol (not the mixed drink you have down there with you), & apply some JB Plastic Weld. It may last a few years or may last forever if applied properly.

https://www.autozone.com/sealants-gl...5ml/477969_0_0

I think Permatex makes a plastic weld as well.
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Old 05-11-2021, 01:25 PM   #7
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Great!
Thanks for the tip (about the alcohol)
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Old 05-11-2021, 04:05 PM   #8
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Quote:
Originally Posted by Wolkstyx1 View Post
Thanks for your reply!
Unfortunately, it appears that it's leaking at the junction between the tank and the connector itself and not the elbow. I guess I'll need to disconnect the elbow and hose and see if there is anyway to tighten or seal the connector to the tank.
if it is the fitting on the tank, I have a proven easy fix for you. You need to drain the tank, then go to Napa or on Amazon and 3 M makes a water proof paste I think it’s called 5200 or something like that you just spread it on the fitting and tank, it takes 24 hrs for it to cure, it will never leak again. No removal necessary. I swear by the stuff I used it below my water line on my boat and never leaked after it cured.
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Old 05-11-2021, 04:15 PM   #9
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Great!
Thanks for the tip (about the alcohol)
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Old 05-13-2021, 12:35 PM   #10
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Also most black tank flush systems on all Forest River units will only tolerate 45psi of water pressure so if you have not used a pressure reducer on you flush hose that could be your issue.
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