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| tank capacities - water and black [message #254323] |
Fri, 04 July 2014 07:44  |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
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Measured the fresh water and black tank capacities. Both are new tanks.
water - 32 gal
black - 20 gal
Looks like I can't count on running out of water before the black tank fills up. Good thing the new tank sensors are accurate. On both, for all practical purposes, F is full and E is empty. Good thing I got the Thermosan working.
In the course of this testing I got to see the water come up out of the floor drain. Good thing the system is, so far, new and unused. I sure don't want to see that happen after it has been "in service".
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: tank capacities - water and black [message #254324 is a reply to message #254323] |
Fri, 04 July 2014 07:57  |
glenn2726
Messages: 234
Registered: June 2014
Location: Topeka, Kansas
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Wow, have to keep an eye on the black water tank for sure. I thought that fresh water and black water tanks were same size as original? So since these are new is that why the difference? I don't think my gauges are connected, PO said prior to him a fresh water tank repair was done and hole for sending unit was plugged..I see a yellow and another wire hanging in the fresh water tank rear against the RR taillight area hanging and not connected to anything..PO said he thought they were for the sending unit. Also said that black tank sending unit did not work..so have to inspect that..fun..Glenn
Glenn W
Topeka, KS
1974 GMC 26 ft. Color:Camel Interior:Canyon Land
Side Bath, Rear Sitting Area
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| Re: tank capacities - water and black [message #254326 is a reply to message #254324] |
Fri, 04 July 2014 08:19 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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glenn2726 wrote on Fri, 04 July 2014 07:57Wow, have to keep an eye on the black water tank for sure. I thought that fresh water and black water tanks were same size as original? So since these are new is that why the difference? I don't think my gauges are connected, PO said prior to him a fresh water tank repair was done and hole for sending unit was plugged..I see a yellow and another wire hanging in the fresh water tank rear against the RR taillight area hanging and not connected to anything..PO said he thought they were for the sending unit. Also said that black tank sending unit did not work..so have to inspect that..fun..Glenn
Based on what I saw when I pulled the black tank, if yours is original, I wouldn't bother to fuss with the sender. Yellow is the sender wire with a White for the connection to ground.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: tank capacities - water and black [message #254327 is a reply to message #254323] |
Fri, 04 July 2014 08:24 |
glenn2726
Messages: 234
Registered: June 2014
Location: Topeka, Kansas
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Yep not gonna mess with the black tank unless I have to...lol..Might have to replace the sender in the fresh water tank so I at leas have a gauge as to how full the black tank is though. Glenn
Glenn W
Topeka, KS
1974 GMC 26 ft. Color:Camel Interior:Canyon Land
Side Bath, Rear Sitting Area
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| Re: tank capacities - water and black [message #254334 is a reply to message #254330] |
Fri, 04 July 2014 09:09 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
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A Hamilto wrote on Fri, 04 July 2014 08:42Maybe to be safe you need to put in a 20 gallon fresh water tank. Does the thermasan system have all the controls working? You have to get to a certain speed before it can engage and so on?
The original Thermosan system used a speed sensor switch (approx 35 mph) and a vacuum switch (don't recall the setting). Between the two of them it was assumed the engine was working hard enough that the exhaust system was hot enough to do the job (again the value is lost to CRS but it is in the books). Those parts are unavailable or expensive. For about $50 I put a temperature sensing system in the exhaust that will start the Thermosan when the exhaust is hot enough. Thus I'm doing it with a direct reading rather than than using indirect methods.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: tank capacities - water and black [message #254335 is a reply to message #254323] |
Fri, 04 July 2014 09:12 |
glenn2726
Messages: 234
Registered: June 2014
Location: Topeka, Kansas
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The 40 gallons should last a while...just have to keep the ladies out of the bathroom...lol...Glenn
Glenn W
Topeka, KS
1974 GMC 26 ft. Color:Camel Interior:Canyon Land
Side Bath, Rear Sitting Area
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| Re: [GMCnet] tank capacities - water and black [message #254357 is a reply to message #254332] |
Fri, 04 July 2014 13:47 |
rjw
Messages: 697
Registered: September 2005
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USAussie wrote on Fri, 04 July 2014 09:53Glenn,
I just checked the 1974 GMC Operators Manual found here: http://www.bdub.net/manuals/ops74/index.html
On page 120 I found this:
Living Area Water Tank . . . . . . . . . . . . . . . . . . . . . . . . . 40 Gal
Holding Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .. . .40 Gal
Regards,
Rob M.
The Pedantic Mechanic
On page 108 of the 1976 Operating Manual that I have, it states:
Living Area Water Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Gal
Holding Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . .32 Gal
I know for a fact that the fresh water tank holds more than the black tank, because once I was taking my neighbor up to Cinnabar to pick up his newly re-engined GMC. I had an empty black tank and full fresh water tank. He used the facilities and neglected to turn off the water faucet and pump. By the time we got to Sandusky, the bathroom had a couple of inches of water sloshing around and you could tell the pump was pumping air (empty fresh water tank). So is is possible to overfill the black tank by quite a bit from the contents of the fresh water tank. Advice to the contrary, may be misleading.
Richard
76 Palm Beach
SE Michigan
www.PalmBeachGMC.com
Roller Cam 455, TBI+EBL, 3.42 FD, 4 Bag, Macerator, Lenzi (brakes, vacuum system, front end stuff), Manny Tranny, vacuum step, Tankless + OEM water heaters.
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| Re: [GMCnet] tank capacities - water and black [message #254360 is a reply to message #254357] |
Fri, 04 July 2014 14:05 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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I had deleted the original email but if I recall the signature line said it was a Transmode. So you cannot go by what it says in the GMC Operating Manual. It all depends on what the builder installed.
Emery Stora
On Jul 4, 2014, at 12:47 PM, RJW wrote:
> USAussie wrote on Fri, 04 July 2014 09:53
>> Glenn,
>>
>> I just checked the 1974 GMC Operators Manual found here: http://www.bdub.net/manuals/ops74/index.html
>>
>> On page 120 I found this:
>>
>> Living Area Water Tank . . . . . . . . . . . . . . . . . . . . . . . . . 40 Gal
>> Holding Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .. . .40 Gal
>>
>> Regards,
>> Rob M.
>> The Pedantic Mechanic
>
>
> On page 108 of the 1976 Operating Manual that I have, it states:
>
> Living Area Water Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Gal
> Holding Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . .32 Gal
>
> I know for a fact that the fresh water tank holds more than the black tank, because once I was taking my neighbor up to Cinnabar to pick up his newly
> re-engined GMC. I had an empty black tank and full fresh water tank. He used the facilities and neglected to turn off the water faucet and pump. By
> the time we got to Sandusky, the bathroom had a couple of inches of water sloshing around and you could tell the pump was pumping air (empty fresh
> water tank). So is is possible to overfill the black tank by quite a bit from the contents of the fresh water tank. Advice to the contrary, may be
> misleading.
> --
> Richard
> 76 Palm Beach
> SE Michigan
> www.PalmBeachGMC.com
>
>
> Coop Roller Cam 455, Howell TBI + EBL, 3.42 FD, Quadra Bag, Macerator, Manny Tranny etc.
>
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| Re: tank capacities - water and black [message #254362 is a reply to message #254323] |
Fri, 04 July 2014 14:24 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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It actually doesn't make much difference what it should be. I've gotta work with what I've got. At least the tank gauges show what is going on.
I did a draw down test on the water tank. 20 gallons out is 1/2 on the gauge.
I'll have to take a look at the black tank and make sure I haven't distorted it somehow when I installed it (I.E. clamped it up too tight.)
The 40 gallon size stated in the op manual sounds like marketing think or, perhaps, original desired capacity that has now been adjusted to match the realities of production and the real world.
Both new tanks visually matched the sizes of the originals and measured about the same and fit with no problems.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] tank capacities - water and black [message #254363 is a reply to message #254360] |
Fri, 04 July 2014 14:25 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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G'day,
Glenn W Topeka, KS 1974 GMC 26 ft. Desert Sand Side Bath
That's the signature line and so I checked the 1974 Operators Manual.
Having said that I have NO idea what a Desert Sand model is or who made it! :-)
Glenn you need to clarify that.
Avions (26' & 23') have 36 gallon fresh water tanks and 40 gallon holding tanks! Guess they were smart enough to realize they'd have
some dumb owners! Self included - I overfilled the black tank hooked to city water once. The operative word in the previous sentence
is ONCE! I may be dumb but I ain't STUPID! ;-)
Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
USA '75 Avion - Double Trouble TZE365V100426
AUS '75 Avion - The Blue Streak TZE365V100428
-----Original Message-----
From: Emery Stora
I had deleted the original email but if I recall the signature line said it was a Transmode. So you cannot go by what it says in
the GMC Operating Manual. It all depends on what the builder installed.
Emery Stora
On Jul 4, 2014, at 12:47 PM, RJW wrote:
> USAussie wrote on Fri, 04 July 2014 09:53
>> Glenn,
>>
>> I just checked the 1974 GMC Operators Manual found here: http://www.bdub.net/manuals/ops74/index.html
>>
>> On page 120 I found this:
>>
>> Living Area Water Tank . . . . . . . . . . . . . . . . . . . . . . . . . 40 Gal
>> Holding Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .. . .40 Gal
>>
>> Regards,
>> Rob M.
>> The Pedantic Mechanic
>
>
> On page 108 of the 1976 Operating Manual that I have, it states:
>
> Living Area Water Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Gal
> Holding Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . .32 Gal
>
I know for a fact that the fresh water tank holds more than the black tank, because once I was taking my neighbor up to Cinnabar to
pick up his newly re-engined GMC. I had an empty black tank and full fresh water tank. He used the facilities and neglected to turn
off the water faucet and pump. By the time we got to Sandusky, the bathroom had a couple of inches of water sloshing around and you
could tell the pump was pumping air (empty fresh water tank). So is is possible to overfill the black tank by quite a bit from the
contents of the fresh water tank. Advice to the contrary, may be misleading.
> --
> Richard
> 76 Palm Beach
> SE Michigan
> www.PalmBeachGMC.com
> t
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] tank capacities - water and black [message #254366 is a reply to message #254332] |
Fri, 04 July 2014 14:56 |
Adrien G.
Messages: 474
Registered: May 2008
Location: Burns Flat, OK 73624
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USAussie wrote on Fri, 04 July 2014 08:53Glenn,
I just checked the 1974 GMC Operators Manual found here: http://www.bdub.net/manuals/ops74/index.html
On page 120 I found this:
Living Area Water Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Gal
Holding Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . .40 Gal
Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
USA '75 Avion - Double Trouble TZE365V100426
AUS '75 Avion - The Blue Streak TZE365V100428
-----Original Message-----
From: Glenn Whitt
Wow, have to keep an eye on the black water tank for sure. I thought that fresh water and black water tanks were same size as
original? So since these are new is that why the difference? I don't think my gauges are connected, PO said prior to him a fresh
water tank repair was done and hole for sending unit was plugged..I see a yellow and another wire hanging in the fresh water tank
rear against the RR taillight area hanging and not connected to anything..PO said he thought they were for the sending unit. Also
said that black tank sending unit did not work..so have to inspect that..fun..Glenn
--
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Rob,
Id like to know how to achieve that 40 gal capacity from the oem tank. I had mine down to repair it, plugged the in and out holes, put a little air it and heated the top to remove the bowl dip shape the tank had.
The best capacity I can get is 29 gal to the top of the tank. 30-1/2 gal to the shower floor.
Maybe 40 gal is to the top of the vents.
The water tank is 32 gal.
FWIW
Adrien & Jenny Genesoto
75 Glenbrook (26-3) Mods LS3.70 FD / Reaction Sys / 80mm Front&Intermidiate / Hydroboost / 16" Tires / Frame Rebuild / Interior Rebuild
Yuba City,Ca. Text 530-nine-3-three-3-nine-nine-6
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| Re: tank capacities - water and black [message #254370 is a reply to message #254323] |
Fri, 04 July 2014 15:45 |
glenn2726
Messages: 234
Registered: June 2014
Location: Topeka, Kansas
Karma: 2
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Hey all sorry for the confusion...as a newbie, I just put the color in for which one it is...It is a 26 footer...Nothing identifies what model it is that I can find, not even the plate in the glove box, I guess PO had it listed as Custom...that's what I was told when I added it to the GM Registry..But it is the standard model with no name...lol...If anyone has any idea where else to look for a name I'm game...Glenn
Glenn W
Topeka, KS
1974 GMC 26 ft. Color:Camel Interior:Canyon Land
Side Bath, Rear Sitting Area
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| Re: tank capacities - water and black [message #254373 is a reply to message #254370] |
Fri, 04 July 2014 16:15 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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In 1974 there were 4 models. The interior code should be written on the glove box sticker along with actual build date. 690 Sequoia, 692 Painted Desert, 693 Glacier, 694 Canyon Land.
http://bdub.net/publications/1974_GMC_Motorhome/1974_GMC_Motorhome_Offerings03.html
glenn2726 wrote on Fri, 04 July 2014 16:45Hey all sorry for the confusion...as a newbie, I just put the color in for which one it is...It is a 26 footer...Nothing identifies what model it is that I can find, not even the plate in the glove box, I guess PO had it listed as Custom...that's what I was told when I added it to the GM Registry..But it is the standard model with no name...lol...If anyone has any idea where else to look for a name I'm game...Glenn
C. Boyd
76 Crestmont
East Tennessee
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| Re: [GMCnet] tank capacities - water and black [message #254374 is a reply to message #254366] |
Fri, 04 July 2014 16:22 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Adrien,
I can't help as both my GMC's are Avions which as the sales brochures of the day noted have 36 gallon fresh water tanks and 40
gallon waste water tanks (supposedly).
http://www.bdub.net/publications/Avion/Avion.htm
http://www.bdub.net/publications/Avion2/avion-int-261.htm
http://www.bdub.net/publications/Avion2/avion-int-231.htm
This thread has piqued my interest and I'm going to measure how much goes into the fresh water tank using 5 gallon H20 dispenser
bottles.
Then I'll turn on the pump and transfer it into the holding tank and see how much more I can add.
Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
USA '75 Avion - Double Trouble TZE365V100426
AUS '75 Avion - The Blue Streak TZE365V100428
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Adrien Genesoto
Sent: Friday, July 04, 2014 2:56 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] tank capacities - water and black
Rob,
Id like to know how to achieve that 40 gal capacity from the oem tank. I had mine down to repair it, plugged the in and out holes,
put a little air it and heated the top to remove the bowl dip shape the tank had.
The best capacity I can get is 29 gal to the top of the tank. 30-1/2 gal to the shower floor.
Maybe 40 gal is to the top of the vents.
The water tank is 32 gal.
FWIW
"When we avoid the mistakes we might have made, we sometimes make the mistakes that we might have avoided."
Adrien & Jenny
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: tank capacities - water and black [message #254377 is a reply to message #254323] |
Fri, 04 July 2014 16:49 |
glenn2726
Messages: 234
Registered: June 2014
Location: Topeka, Kansas
Karma: 2
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Senior Member |
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Ok,mine says Model #ZE-06581, Base 160, Manufactured 12/10/1973, Color Camel. Doesn't say anywhere the interior code or anything with a different model number. Looking at the brochures my interior is the Canyon Land, can't find the exact floor plan as mine has the Double Passenger Seat in it, and originally had the two chairs on the Driver side but one of the POs replaced with a couch. Glenn
Glenn W
Topeka, KS
1974 GMC 26 ft. Color:Camel Interior:Canyon Land
Side Bath, Rear Sitting Area
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| Re: [GMCnet] tank capacities - water and black [message #254379 is a reply to message #254374] |
Fri, 04 July 2014 17:01 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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+ 6 gallons in water heater.
USAussie wrote on Fri, 04 July 2014 17:22Adrien,
I can't help as both my GMC's are Avions which as the sales brochures of the day noted have 36 gallon fresh water tanks and 40
gallon waste water tanks (supposedly).
http://www.bdub.net/publications/Avion/Avion.htm
http://www.bdub.net/publications/Avion2/avion-int-261.htm
http://www.bdub.net/publications/Avion2/avion-int-231.htm
This thread has piqued my interest and I'm going to measure how much goes into the fresh water tank using 5 gallon H20 dispenser
bottles.
Then I'll turn on the pump and transfer it into the holding tank and see how much more I can add.
Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
USA '75 Avion - Double Trouble TZE365V100426
AUS '75 Avion - The Blue Streak TZE365V100428
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Adrien Genesoto
Sent: Friday, July 04, 2014 2:56 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] tank capacities - water and black
Rob,
Id like to know how to achieve that 40 gal capacity from the oem tank. I had mine down to repair it, plugged the in and out holes,
put a little air it and heated the top to remove the bowl dip shape the tank had.
The best capacity I can get is 29 gal to the top of the tank. 30-1/2 gal to the shower floor.
Maybe 40 gal is to the top of the vents.
The water tank is 32 gal.
FWIW
"When we avoid the mistakes we might have made, we sometimes make the mistakes that we might have avoided."
Adrien & Jenny
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GMCnet mailing list
Unsubscribe or Change List Options:
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C. Boyd
76 Crestmont
East Tennessee
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