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Old 06-09-2015, 04:10 PM   #1
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Should my black water tank have a hole?

Hi everyone,

My wife and I just purchased a 2002 Coachman Mirada to get back into RVing. I am in the process of checking the systems and fixing all the little broken parts. I just noticed a three inch hole melted in the bottom of my black water tank. I also noticed that there seems to be old dried, well you know, coming from it. It is near the bottom of the tank and the tank holds water. I have only filled it with about five gallons but no leak and the slide valve releases the waste like it should. I stuck a stick in there and it hits something like another bottom in the tank about an inch and a half above the outside bottom. Has anyone seen this before? Is it normal? Should I just seal the hole?

Thanks for your help.
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Old 06-09-2015, 04:25 PM   #2
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Looks like you need a new tank. That can't be good. You should have a discharge port, and intake port, and if a equipped an entry area for your rinse unit. The last would be an vent connection. That does not look like any of them.

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Old 06-09-2015, 04:25 PM   #3
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Is your shower located above that tank? It might be an integrated overflow pan for the shower to drain into in the event that the ptrap or drain leaks.
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Old 06-09-2015, 05:32 PM   #4
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I would keep adding water until it comes out at the hole or the tank is full. If it fills up without running out the hole, I would not worry about it. If it starts pouring out the hole, I would patch it. Changing the black water tank is not a fun job. You have to find the right tank. get it ordered. To install it you have three openings. The in opening at the toilet. T he vent opening and the outlet. Repairing is the best way to go. This is from someone who has done both.
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Old 06-09-2015, 05:48 PM   #5
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the tank is a will fit, it is used in many applications the hole you see is for another application.

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Old 06-09-2015, 06:07 PM   #6
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Maybee that hole use to be the old "exit" for the tank and for some reason, it was repositioned where it is now. If it does not leak, just leave it alone.
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Old 06-09-2015, 10:47 PM   #7
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I think Beachdude may be on to something. It does look like a two part tank, and that hole is meant to be there. Like others said fill your black tank full of water, and see if it leaks. Don't go fixing a problem before you know it is one.
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Old 06-10-2015, 12:29 AM   #8
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Welcome to irv2.
This link should help you out, you can input what you need to know and get many pictures and diagrams.
Looks like its your black tank as your describe the waste from it, dropped fitting maybe for some other MFG use different model coach.
I would clean up the fitting and glue a cap using PCP pipe fitting cement just to ease your mine in future use of your black tank use.
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Old 06-10-2015, 04:42 AM   #9
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thanks for the info

Thank you all for the ideas. I can't see how this could be something wrong with the tank. This hole looks like it had to be melted through before the tank was sealed together. I am going to fill the tanks with water so they are totally full and see what happens. I will add something to color the water in the black tank so I can tell where the water comes from. I was thinking that it was some kind of overflow I didn't know that even existed. If that is it I will plumb it to empty on the ground not the bay of the RV. I am used to the shower backing up into the tub if you forgot to get rid of the water. This new RV has a shower pan so you could use the sink and the water would overflow from the shower drain to the floor pretty quickly. I washed the crud from the hole I thought it was toilet waste but it could have been old grease and stuff from an overflow. I'll see what happens and update this soon. Thanks again for your help.
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Old 07-23-2015, 03:06 PM   #10
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Problem solved

The previous owners tried to add heaters to the tanks and melted the tank in the process. They used pipe heaters and just glued them to the tanks. I ended up heating the edges of the hole so they were flat then I cut a piece of plastic larger than the hole, drilled holes around the edge, threaded the tank holes and sealed the edge with calking and used 3/8" nylon bolts to hold the patch in place. It fixed the problem. Thanks again for the information.
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Old 07-23-2015, 03:49 PM   #11
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That's exactly what I would have done. It's just a tank.. no pressure.

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water, tank

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