Black tank says full but it’s empty
Fairly new RV. Have rigorously followed instructions regarding emptying only when full, keeping water in the bottom, using a black tank tablet. On a recent trip, I was surprised to see the black ta...
Forum Discussion
First you need to understand what the sensor is.. Basically a nail or screw.
That's all. Just a metal rod that sticks into the tank. THe system assumes that if the rod is wet the tank is "rod" full. (That is wet and shorted to ground by the wet).
Problem is that the sides of the tank get "Slimed" (Think ghostbusters) and the Slime is wet so it grounds out the sensor and the tank thus reads FULL even though if the things are lighed up properly and you use a clear extension on the outlet port you can look down teh toilet and see daylight.
Using the flusher (San-T-Flush) may help (not very likely)
SUing a wand like the Twister tank flushing wand might
Valterra Master blaster is a very well designed want in terms of how it works. but ... I do not think it will last long since the nozzle may well break off first time you use it.. Thinking like the engineers at Valterra I built my own version without the nozzel. Just a PVC pipe. hose fitting (Vacuum breaker and valve)( on one end and a cap on the other with a 7/32" (I grabbed a bit close to 1/4. that was the bit I grabbed) hole in it.. On rare occasions if I "Aim" for the sensors.. I can blast 'em clean.
Basically I don't bother any more. I just ignore the sensors.
That's all. Just a metal rod that sticks into the tank. THe system assumes that if the rod is wet the tank is "rod" full. (That is wet and shorted to ground by the wet).
Problem is that the sides of the tank get "Slimed" (Think ghostbusters) and the Slime is wet so it grounds out the sensor and the tank thus reads FULL even though if the things are lighed up properly and you use a clear extension on the outlet port you can look down teh toilet and see daylight.
Using the flusher (San-T-Flush) may help (not very likely)
SUing a wand like the Twister tank flushing wand might
Valterra Master blaster is a very well designed want in terms of how it works. but ... I do not think it will last long since the nozzle may well break off first time you use it.. Thinking like the engineers at Valterra I built my own version without the nozzel. Just a PVC pipe. hose fitting (Vacuum breaker and valve)( on one end and a cap on the other with a 7/32" (I grabbed a bit close to 1/4. that was the bit I grabbed) hole in it.. On rare occasions if I "Aim" for the sensors.. I can blast 'em clean.
Basically I don't bother any more. I just ignore the sensors.
