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As noted, many RV manufacturers plumb the bath sink to the black tank for several reasons. It balances out the tank loads as most RV'ers make more grey water than black.
It also ensures that water is IN the black tank to aid in decomposition and prevent the 'black mountain' effect.
On three of our RVs, 2 diesel pushers and one fifth wheel, we discovered that the black tank vent pipe went too far into the tank. As the black tank filled and the level overcame the vent pipe opening, the tank pressurized.
It depressurized after my DW went to the do a #1 and when she flushed, it blew back in her face. Needless to say, got that fixed right away.
Sorry about all your issues. The RV industry is not like the car industry.
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Jim
2017 Gemini 23TR
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