We thought we knew how to flush the black tank on our new Sanibel 3901, but apparently we don't or it's not working like it should. We opened the tank and drained it, hooked up the water to flush, turned it on and pulled the lever and nothing. Any advice or hints. Can't find anything online.
We have a 2014, 3500. The black tank on ours is 50 gal. What I have learned to do is to time the water as I'm flushing, mine flows about 2 gals a minute back into the tank. I fill it up with 35 to 40 gallons then open the dump valve and let it drain. I have also bought a clear nozzle so I can see what is draining out thru the hose. I flush it as described until the water coming out is mostly clear. I use an enzyme treatment in the tank called Micro-Blaze so if we are not going to use the camper for a couple of weeks, I add about 20 gallons of water back and put a dose of the treatment in and let it slosh around on the way home. The first thing that I do on our next trip after we get to the campground is to flush and drain the tank.
We have found that the more flow you have when you drain the more of the heavier material will be removed. Hope this helps.
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