GMC Motorhome Black Tank Replacement
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- เผยแพร่เมื่อ 27 ส.ค. 2024
- We have been having a problem with the black tank leaking when it's almost full and sewer smells when driving. The black tank seems to be original so I decided to replace it. This was the longest and worse project I have done yet, mostly because I made a few mistakes along the way. I hope if you ever have to do this project it goes better for you.
Here are some of the key parts and tools I used.
Black tank:
www.gmcrvparts...
Blade valve:
www.gmcrvparts...
Level sensor:
www.gmcrvparts...
Toilet seal:
amzn.to/3vwQe12
Hole saw (1 1/2"):
amzn.to/43AcGDk
Hole saw (2 3/4"):
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Hole saw (2 1/2")
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Expanding foam:
amzn.to/3TyVvNO
Thank you for this...I have an original '76 23ft and will need to do this project also...again thx for all your work and videos...👍🤠
Thanks for the encouragement! Good luck on your projects!
Thanks for the heads up on the measuring mistakes you made. Also, good to see you back.
If I save other some frustration then it will be worth it! Until I find a good shop to work it, my winters are going to be slow on videos. ;-)
Great video - Thanks for the details. I truly hope this project never comes my way- but Hey! the macerator is gonna be a game changer!
I'm really looking forward to being totally done and, fingers crossed, never have to deal with this again. :-)
Great video, thanks.
I just did gas tank pull on mine. I built ramps for the rear wheels (off the GMC sites). Backed it up on the ramps with air bags up hi and then put supports (big jackstands) under chassis. This gave me plenty of working room. I also used ratchet straps to help get tanks in and out. Not sure if they will work on black tank as I haven’t had to cross that bridge yet.
I'll probably build some ramps at some point, They would help a lot for all the "under the coach" projects that I do. The ratchet straps are a great idea, I'll keep that in mind if I drop the gas tanks (I hope to never drop the black tank again).
I am gagging as I watch this KNOWING I will have to do this one day
It's not fun but not as bad as I expected from gagging standpoint. I highly recommend replacing everything rather than trying to reuse nasty parts.
Out of interest what are the dimensions of the black tank? If one were to fit a battery bank under the floor what is the dimensions?
The black tank dimensions are 35" x 53" x 6". Most people who are thinking about turning these into electric drive replace the two fuel tanks with battery banks. There is a nice top down image of the frame in this article. silodrome.com/history-gmc-motorhome/ the black tank is behind the rear fuel tank.
It's interesting seeing how things are evolving, I see a lot of people outside of the GMC scene having recycled hot water. So it just runs the shower in a loop through a filter and only when you soap only then do you hit a switch and dump it into the tank. The family are happy as there is no clock watching as you take a shower in the morning. I only ask about the battery as running a thin 4" high battery block in a frame would tie the chassis together too.