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Old 09-30-2012, 09:53 PM   #1
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black tank shape?

I've been having some issues with my black tank not flushing. I am pretty sure it's not just a clogged sensor; I can see the high water level in the toilet. Today I was able to at least partially flush it and look down. There's about a foot and a half of pipe down and then what looks like maybe a 2 in tall tank. The pipe down appears to have been clogged by a pack of TP. I fished out the TP with a self made hook and was able to see the bottom of the tank.

This is a surveyor sport sp-189; anyone know how that tank looks like and what to expect?
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Old 10-02-2012, 01:42 PM   #2
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Quote:
Originally Posted by Skelshy View Post
I've been having some issues with my black tank not flushing. I am pretty sure it's not just a clogged sensor; I can see the high water level in the toilet. Today I was able to at least partially flush it and look down. There's about a foot and a half of pipe down and then what looks like maybe a 2 in tall tank. The pipe down appears to have been clogged by a pack of TP. I fished out the TP with a self made hook and was able to see the bottom of the tank.

This is a surveyor sport sp-189; anyone know how that tank looks like and what to expect?
Sounds like the toilet drop tail pipe is too long, extends into the tank too far. You can clean and flush the tank, remove the head with two bolts and one soft pipe connection. Then you can have accesss to the installation. If indeed is only two inches to tank bottom it may be too close. Most tanks I've seen are 3-4" depth or more. To confirm you can remove skirting one either end of the tank and measure tank height. Sometimes there may be a shelf on the outboard ends but the head will we inboard of this. Now you have a 2" tank, when filled 2" all contents will be trapped like in a dam. At these numbers you only have an approx. 20 gallon tank.
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Old 10-02-2012, 01:48 PM   #3
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If you have a lot of solids in the tank directly under the toilet, it's an indicator that you're not putting enough water down when using it.

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Old 10-03-2012, 09:02 AM   #4
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I agree. LOTS of water is your friend when dealing with the black tank.
Always start with 4-5 gallons of water before the first "shoe" drops.

Here are some common black tank photos to show you the shape.
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Old 10-03-2012, 08:07 PM   #5
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Originally Posted by herk7769 View Post
I agree. LOTS of water is your friend when dealing with the black tank.
Always start with 4-5 gallons of water before the first "shoe" drops.

Here are some common black tank photos to show you the shape.
Here's what I'm thinking, the original complaint was tank not M/T correctly and when he could see down he estimated only two inches between the tail pipe and the tank bottom. Using the wand pictured I attach, I hook the tail pipe and measure vertically to the tank bottom. I can move the wand 3-4" up and down and use that clearance to change the angle and dirction while powered. Point is I'v got 4-5 inches total between the tailpipe and tank bottom. Only 2" would mean that with the tank less than half full it would seal off the drop. Without movement like on the road nothing would leave that tiny space except liquids. Believe that where his problem started. I guess the purpose of the pipe is to prevent sloshing, but not cut tank volume in half. Worth the measument.
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