Black Tank Issue II or Too or #2

[JBird1960]

Our 2018 Precept 31UL has a macerator pump and small diameter flexible hose. The black tank gauge lights haven’t gone below 2/3 for a month, even though it seems to drain until it runs out. Gray tank is working fine. I’m hoping the gauge is faulty and not that there’s a clog with soon only one way out...inside. Anyone else have this experience?

[hawkster]

The gauges are inaccurate or have gunk on them.

[Cannon]

Mine was doing that last trip. Ran black tank flush for about 20min letting it fill up tank for a couple of min. and then empty. After doing this several times it read empty again.

[Higgy]

What Cannon said or fill it half full and drive with it to next destination and let it slosh around to clean the sensor off.