Geeze, like doing an interrogation.
You keep dropping bits of info as to the tank and what your goal is.
Back to the OP…
HOB overflows can be safe to run, or not.
All in the assembly and maintenance.
They can gurgle big time or not.
Again, all in how they get set up.
Something as simple as a search of MFK, overflow HOB, will answer any questions you have.
The more effort you put into this, the greater your chance of success.
