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Old 04-23-2022, 11:43 AM   #1
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377RLBH Black Tank Flush

I was on my maiden break in trip for our new 377RLBH, I went ahead and emptied all the and and began to utilize the blank tank flush. Not soon after I began to see water come from the underbelly, it eventually trickled to a slow drip after a turned everything off. I did test the toilet and filled the tank twice and emptied with no further issues. I did not try the tank flush again, do you think the valve could of blown off or water came out of the vent pipes? Trying to narrow down the issue.
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Old 04-23-2022, 01:53 PM   #2
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Did you remember to leave ALL the black tank valves open while flushing? The water must be able to go down the drain while flushing.
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Old 04-23-2022, 05:04 PM   #3
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I assume you emptied the black tank, then ran the black tank flush (with empty tanks)? This sounds like a leak in the black tank flush plumbing.

Leak could be anywhere in this plumbing; flusher mount at the tank, line, vacuum break, connection to outside fitting...

Can you get to the backside of where the outside hose connection is, to check for leaks?

You may have to unscrew some of the black plastic underbelly where the black tank is, pull down, and take a look.


A black tank vent leak happens when the tank is over filled up past the vent connection, and the connection was not properly installed/sealed at the factory.
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