Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 06-09-2015, 04:10 PM   #1
Junior Member
Join Date: Jun 2015
Posts: 3
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.
Attached Thumbnails
Click image for larger version

Name:	DSC01667.JPG
Views:	156
Size:	255.1 KB
ID:	96764  

billncari is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 06-09-2015, 04:25 PM   #2
Senior Member
Winnebago Owners Club
Freightliner Owners Club
Join Date: Apr 2015
Location: Western WI
Posts: 688
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.

2001 Itasca Horizon 36LD Cat
Retired Air Force, One lovely Angel, 2 Cats and three birds.
the_vfox is offline   Reply With Quote
Old 06-09-2015, 04:25 PM   #3
Senior Member
Thor Owners Club
Ford Super Duty Owner
Join Date: Oct 2013
Posts: 758
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.
BeachDude is offline   Reply With Quote
Old 06-09-2015, 05:32 PM   #4
Senior Member
Ford Super Duty Owner
Join Date: Dec 2009
Location: Mcdonough, Ga.
Posts: 4,548
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.
1998 Pace Arrow 35 ft. F53 Ford V10 2012 Honda Civic toad
32 years mechanic at Delta Air Lines 15 year motorhome service manager. 3 popups....2 travel trailers....5 motorhomes....loved them all.
ga traveler is online now   Reply With Quote
Old 06-09-2015, 05:48 PM   #5
Senior Member
Pds47's Avatar
Monaco Owners Club
Holiday Rambler Owners Club
Join Date: Oct 2012
Location: Tucson AZ
Posts: 260
Blog Entries: 1
the tank is a will fit, it is used in many applications the hole you see is for another application.

plug it
Paul & Megan 2007 Neptune XL 36 PDQ REK Bilsteins, KarKaddy,mini cooper, W/ Bear and Sedona
Pds47 is offline   Reply With Quote
Old 06-09-2015, 06:07 PM   #6
Registered User
Gulf Streamers Club
Join Date: Jun 2010
Location: Trois-Rivieres, QC, Canada
Posts: 414
Send a message via Skype™ to normandlegra
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.
normandlegra is offline   Reply With Quote
Old 06-09-2015, 10:47 PM   #7
Senior Member
Join Date: May 2014
Posts: 2,958
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.
Mike & Charlotte
2014 Newmar Canyon Star 3610
Orange County, California
Mike and Cha is offline   Reply With Quote
Old 06-10-2015, 12:29 AM   #8
Community Moderator
"007"'s Avatar

Nor'easters Club
Workhorse Chassis Owner
iRV2 No Limits Club
Join Date: Oct 2004
Posts: 27,877
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.
This link will help you get around the forums, enjoy your stay.
98KSCA, 99MACA, 03 KSCA-3740- 8.1 Chev-- ALLISON Trans, now in good hands
"007" is online now   Reply With Quote
Old 06-10-2015, 04:42 AM   #9
Junior Member
Join Date: Jun 2015
Posts: 3
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.
billncari is offline   Reply With Quote
Old 07-23-2015, 03:06 PM   #10
Junior Member
Join Date: Jun 2015
Posts: 3
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.
billncari is offline   Reply With Quote
Old 07-23-2015, 03:49 PM   #11
Senior Member
Todd157k's Avatar
Join Date: Jan 2015
Location: So.Cal.
Posts: 297
That's exactly what I would have done. It's just a tank.. no pressure.

2013 Itasca Sunova 30A
2006 Crownline 250cr
2012 Ram Laramie Longhorn
Todd157k is offline   Reply With Quote

water, tank

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Thor Challenger Owners Unite! DGShaffer Thor Industries Owner's Forum 3153 Yesterday 08:32 AM
Do I need the expansion tank for water heater? Lemon Twist Class A Motorhome Discussions 13 05-22-2016 06:32 AM
Black water tank Vetl82 5th Wheel Discussion 23 06-17-2014 01:53 PM
Hot water tank cleaning Pilot135pd RV Systems & Appliances 7 01-20-2014 08:40 AM
Coachmen: Black water tank won't open '07 Concord ladyrvr66 Forest River Owners Forum 5 01-19-2014 04:58 PM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 08:21 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.