Home » Public Forums » GMCnet » Water tank drain location
| Water tank drain location [message #308758] |
Sat, 15 October 2016 13:10  |
Atom Ant
Messages: 170
Registered: October 2016
Location: Austin, TX
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I'm trying to drain the fresh water tank. I looked under the rear couch for a drain and didn't find one. There is a drain on the hall closet. Opening it reveals water. With the water pump on, would this drain the tank if I ran a hose out the door?
1976 Palm Beach
Austin, TX
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| Re: [GMCnet] Water tank drain location [message #308760 is a reply to message #308758] |
Sat, 15 October 2016 13:43  |
sgltrac
Messages: 2797
Registered: April 2011
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There should be a drain at or very close to the holding tank. Have you
looked around the tank/pump area?
Sully
77 eleganza 2
Seattle
On Saturday, October 15, 2016, Adam Metzger wrote:
> I'm trying to drain the fresh water tank. I looked under the rear couch
> for a drain and didn't find one. There is a drain on the hall closet.
> Opening
> it reveals water. With the water pump on, would this drain the tank if I
> ran a hose out the door?
>
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: Water tank drain location [message #308764 is a reply to message #308758] |
Sat, 15 October 2016 13:54 |
zhagrieb
Messages: 676
Registered: August 2009
Location: Portland Oregon
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Evil engineers conspired to hide those things and PO's may have made it worse. The valve in your closet is on the pressure side of things so won't help. There may be a valve in the propane compartment that will. Keep looking, it has to be back near the tank. There should be other valve to drain the sink lines, the bathroom lines and the water heater.
My choice is to drain the fresh tank, bypass and drain the water heater, put a couple of gallons of RV antifreeze (never the automotive stuff) in the fresh tank and let the pump flood all the pipes. Don't forget some antifreeze in the sink traps and in the black tank 'cause there will always be something left in there.
Glenn Giere, Portland OR, K7GAG
'73 "Moby the Motorhome" 26'
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| Re: Water tank drain location [message #308765 is a reply to message #308758] |
Sat, 15 October 2016 14:07 |
Atom Ant
Messages: 170
Registered: October 2016
Location: Austin, TX
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The answer is yes! I guess the PO put this in as a way to flush the black tank without having to drag a hose into the bathroom from outside. Now I can drain and disinfect my fresh tank.
1976 Palm Beach
Austin, TX
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| Re: Water tank drain location [message #308768 is a reply to message #308758] |
Sat, 15 October 2016 14:47 |
Atom Ant
Messages: 170
Registered: October 2016
Location: Austin, TX
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.....and hopefully there is a water pump auto cut off when the tank is dry?? Drained the tank, now pump won't come on at switch. Haven't filled it yet.
1976 Palm Beach
Austin, TX
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| Re: [GMCnet] Water tank drain location [message #308771 is a reply to message #308770] |
Sat, 15 October 2016 16:38 |
Atom Ant
Messages: 170
Registered: October 2016
Location: Austin, TX
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Thanks for the invite, Billy! I may take a drive out. You learn quite fast to have no reasonable expectations of distance when someone tells you about towns in Texas! Where in CenTex are you?
1976 Palm Beach
Austin, TX
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| Re: [GMCnet] Water tank drain location [message #308772 is a reply to message #308770] |
Sat, 15 October 2016 16:38 |
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There is supposed to be a drain at center, rear that goes through the
floor. That valve is often stuck and won't turn. If so, you'll have to
remove and replace it. There is no switch that controls the pump if it is
out of water. It will soon run your battery down.
Come to the Classics a rally at Rusk, Texas and I'll show you how.
On Oct 15, 2016 2:48 PM, "Adam Metzger" wrote:
>
> .....and hopefully there is a water pump auto cut off when the tank is
dry?? Drained the tank, now pump won't come on at switch. Haven't filled
it yet.
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bdub
bdub.net
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| Re: [GMCnet] Water tank drain location [message #308774 is a reply to message #308772] |
Sat, 15 October 2016 16:53 |
k2gkk
Messages: 4452
Registered: November 2009
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AFIK, the water pump is only active (running) if the rocker switch at entry door is .toggled!
Mac Macdonald in OKC
'76 ex Palm Beach
"The Money Pit"
Sent from my iPad
> On Oct 15, 2016, at 16:39, Billy Massey wrote:
>
> There is supposed to be a drain at center, rear that goes through the
> floor. That valve is often stuck and won't turn. If so, you'll have to
> remove and replace it. There is no switch that controls the pump if it is
> out of water. It will soon run your battery down.
>
> Come to the Classics a rally at Rusk, Texas and I'll show you how.
>
>> On Oct 15, 2016 2:48 PM, "Adam Metzger" wrote:
>>
>> .....and hopefully there is a water pump auto cut off when the tank is
> dry?? Drained the tank, now pump won't come on at switch. Haven't filled
> it yet.
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: [GMCnet] Water tank drain location [message #308778 is a reply to message #308774] |
Sat, 15 October 2016 17:44 |
Atom Ant
Messages: 170
Registered: October 2016
Location: Austin, TX
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Here's what happened.
I was
Looking for a drain for the holding tank, and found a hose with a valve on it in the closet.
Hooked garden hose up to this, and opened valve.
Nothing happen d until I flipped the water pump switch on the main panel. the pump kicked on, as it has worked with no issues.
Water continued to flow, so I walked away for a minute.
Came back, water was not flowing, pump was off, switch still on.
The water tank is empty(by the sound of me knocking on it)
The pump will not kick on when I flip the switch.
Had to leave at that point, so I have not filled it to see if the pump will prime with water.
It's not OEM pump.
Any ideas?
Also, when running on city water, does it fill the tank? Does it use the pump or pressure from the hose?
Thanks for you patience with my infinite questions.
1976 Palm Beach
Austin, TX
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| Re: [GMCnet] Water tank drain location [message #308782 is a reply to message #308778] |
Sat, 15 October 2016 19:55 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Adam,
Answers in-line in CAPS...
Atom Ant wrote on Sat, 15 October 2016 18:44Here's what happened.
I was Looking for a drain for the holding tank, and found a hose with a valve on it in the closet.
THIS IS NOTHING STOCK, YOU WILL HAVE TO TRACK IT DOWN.
Problem: convention has the holding tank as sewer tank. The other is the water or potable.
Hooked garden hose up to this, and opened valve.
Nothing happened until I flipped the water pump switch on the main panel. the pump kicked on, as it has worked with no issues.
Water continued to flow, so I walked away for a minute.
Came back, water was not flowing, pump was off, switch still on.
The water tank is empty(by the sound of me knocking on it)
IF THE PUMP RAN AND STOPPED, THE WATER TANK IS PROBABLY NOT REALLY EMPTY.
The pump will not kick on when I flip the switch.
THE POTABLE PUMP IS PRESSURE CONTROLLED. IT WILL ONLY PUMP ON DEMAND. (A TAP IS OPEN)
Had to leave at that point, so I have not filled it to see if the pump will prime with water.
It's not OEM pump.
AT THIS AGE ALMOST, NONE ARE.
Any ideas?
Also, when running on city water, does it fill the tank? Does it use the pump or pressure from the hose?
CITY WATER COMES INTO THE SYSTEM UPSTREAM OF A CHECK VALVE THAT IS NEAR THE POTABLE PUMP.
Thanks for you patience with my infinite questions.
You really need to get to that rally and find out what and where things are supposed to be.
It sounds like the exterior city water feed has been moved inside. That is not a difficult repair.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: Water tank drain location [message #308784 is a reply to message #308758] |
Sat, 15 October 2016 20:18 |
Atom Ant
Messages: 170
Registered: October 2016
Location: Austin, TX
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Thanks Matt!
I mis spoke. I was looking to drain the FRESH WATER tank, not the black water tank.
See, my father in law decided to fill the fresh water tank using the same hose that we used THE DAY BEFORE to rinse out the black water tank, through the toilet. How do I know which end went into the toilet? I don't.
So my goal here is to run bleach through the whole system. Per my beautiful brides' gentle demands.
1976 Palm Beach
Austin, TX
[Updated on: Sat, 15 October 2016 20:20] Report message to a moderator |
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| Re: Water tank drain location [message #308798 is a reply to message #308796] |
Sun, 16 October 2016 10:32 |
Dan Gibb
Messages: 24
Registered: May 2015
Location: Tucson, Arizona
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Unless his faucets are totally different than any others, the female end is the only one that will attach to it. The male end had to be the one that he used to clean with.
Dan Gibb
1977 Eleganza II
Tucson, Az
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| Re: [GMCnet] Water tank drain location [message #308799 is a reply to message #308798] |
Sun, 16 October 2016 10:50 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Hoses are cheaper than trying to cure hepatitis. Throw it away. We use our
potable water tank exclusively in our coach. Hooked up to city water one
time and awoke to water running out the door. Not fun. But we do not drink
the water from the potable tank. Wash dishes, shower, flush toilet, is what
we do. Cook with bottled water. Reason? I have a well at home and no
chlorine. So when I fill my potable tank with it, it is questionable
whether long term use is wise. Just us. I am not too keen on drinking
bleach.
Jim Hupy
Salem, Or.
78 GMC ROYALE 403
On Oct 16, 2016 8:33 AM, "Dan Gibb" wrote:
> Unless his faucets are totally different than any others, the female end
> is the only one that will attach to it. The male end had to be the one that
> he used to clean with.
> --
> Dan Gibb
> 1977 Eleganza II
> Tucson, Az
>
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