Home » Public Forums » GMCnet » Gravity Water Fill Cap (Gravity Water Fill cap)
| Gravity Water Fill Cap [message #310942] |
Sat, 26 November 2016 16:31  |
jknezek
Messages: 1057
Registered: December 2007
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Has anyone found a replacement for the tank water fill cap on a '76-'78? Not the city water, but the water tank filler that is behind the driver's side door on the later models? The inlet is threaded so a Valera cap, while the correct size, won't work since it is not threaded. Otherwise anone got a later model they are parting out I can have the fill cap from? Who knew this would be such a hard item to find?
Thanks,
Jeremy Knezek
1976 Glenbrook
Birmingham, AL
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| Re: Gravity Water Fill Cap [message #310946 is a reply to message #310943] |
Sat, 26 November 2016 17:41  |
jknezek
Messages: 1057
Registered: December 2007
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I called Applied. According to them they don't have what I need so I'm assuming that is not a threaded cap.
Thanks,
Jeremy Knezek
1976 Glenbrook
Birmingham, AL
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| Re: Gravity Water Fill Cap [message #310958 is a reply to message #310942] |
Sat, 26 November 2016 22:25 |
pzerkel
Messages: 212
Registered: September 2007
Location: Salisbury, IL
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Hmm, this sounds like a project for one of the 3d printer guys around? My 78 cap is working for now, but I cold see it getting brittle. I am willing to take some measurements if any of the 3d guys want to try it.
Paul Zerkel
'78 Eleganza II
Salisbury IL (near Springfield)
[Updated on: Sat, 26 November 2016 22:25] Report message to a moderator |
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| Re: [GMCnet] Fw: Re: Gravity Water Fill Cap [message #310972 is a reply to message #310963] |
Sun, 27 November 2016 07:23 |
jknezek
Messages: 1057
Registered: December 2007
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It's not and you might be able to. It is my last resort. However, the piece in my GMC you would need to remove is not round like the replacements. It's kind of horseshoe shaped. So it isn't a simple swap for either this round one, or the square option. That's why I'm tring so hard to just find a cap!
Thanks,
Jeremy Knezek
1976 Glenbrook
Birmingham, AL
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| Re: [GMCnet] Fw: Re: Gravity Water Fill Cap [message #310975 is a reply to message #310972] |
Sun, 27 November 2016 07:43 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
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Just plumb a bypass valve from a tee in the city water line to a tee at the
outlet of the tank. That way you don't need the gravity fill -- just turn
the water pump off and open the bypass valve to fill the tank.
'Course that don't help them none who likes to use water buckets. :-)
Ken H.
On Sun, Nov 27, 2016 at 8:23 AM, Jeremy wrote:
> It's not and you might be able to. It is my last resort. However, the
> piece in my GMC you would need to remove is not round like the replacements.
> It's kind of horseshoe shaped. So it isn't a simple swap for either this
> round one, or the square option. That's why I'm tring so hard to just find a
> cap!
> --
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: Gravity Water Fill Cap [message #310977 is a reply to message #310942] |
Sun, 27 November 2016 08:41 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
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Ken can't that over power the tank overflow and "wet the rug"? I you don't pay attention
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Gravity Water Fill Cap [message #310979 is a reply to message #310977] |
Sun, 27 November 2016 09:04 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
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John,
Perhaps. In my case, no, because I converted the large (1"?) gravity feed
port to be the overflow. Stainless steel wool in that drain keeps the
critters out.
More recently, I converted the whole thing to electronic control: A $5 or
so board controls a $5 12VDC valve. When the H20 level drops below a pair
of well nuts (Common & Low), the valve's opened. When the H20 reaches the
Full well nut, the valve closes. No more laying down watching the level
rise in the translucent tank with a light behind it.
For those who don't want city water pressure inside the coach, this would
seem to be an ideal setup -- mount the valve immediately downstream of the
water inlet check valve so that there's always water in the tank but seldom
city water pressure inside. Manual switching can prevent unattended
filling, or can override the control to top off a partially full tank --
still under automatic full protection.
Ken H.
On Sun, Nov 27, 2016 at 9:41 AM, John R. Lebetski
wrote:
> Ken can't that over power the tank overflow and "wet the rug"? I you
> don't pay attention
> --
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: Gravity Water Fill Cap [message #310983 is a reply to message #310942] |
Sun, 27 November 2016 11:05 |
jknezek
Messages: 1057
Registered: December 2007
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Man we are in mountain and mole hill territory. There is nothing wrong with my fill system. I just would like a cap that fits the existing inlet. It looks like that is hard, if not impossible to find, so I may go without, counting on the door to keep the critters out, or I'll change it out with some effort to a more common inlet. Just looking for simple first. A new cap would be great!
Thanks,
Jeremy Knezek
1976 Glenbrook
Birmingham, AL
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| Re: [GMCnet] Gravity Water Fill Cap [message #310996 is a reply to message #310983] |
Sun, 27 November 2016 13:50 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
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Jeremy,
I just can't understand why anyone would want to use gravity feed -- unless
they're dry camping and want to fill from a mountain stream or something.
Otherwise, sticking a water hose into a gravity port seems to me sort of
"old fashioned" -- not the thing for our MODERN coaches. :-)
Guess I should try to remember what it was like to be young, with kids and
a job occupy my time, tho', instead of needing a GMC to find things to do
to, huh?
Ken H.
On Sun, Nov 27, 2016 at 12:05 PM, Jeremy wrote:
> Man we are in mountain and mole hill territory. There is nothing wrong
> with my fill system.
...
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Gravity Water Fill Cap [message #310998 is a reply to message #310996] |
Sun, 27 November 2016 15:08 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
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Ken Henderson wrote on Sun, 27 November 2016 14:50Jeremy,
I just can't understand why anyone would want to use gravity feed -- unless
they're dry camping and want to fill from a mountain stream or something.
Otherwise, sticking a water hose into a gravity port seems to me sort of
"old fashioned" -- not the thing for our MODERN coaches. 
Guess I should try to remember what it was like to be young, with kids and
a job occupy my time, tho', instead of needing a GMC to find things to do
to, huh?
Ken H.
Ken,
Apart from filling from a mountain stream (Which I have done), there is also the case of non-FHU cramp grounds that have a single hydrant that has a hose with no threads anywhere in sight.
Then there is the fact that you don't know because you can fill unattended (which I think is great) and that is the admittance of a straight hose is higher than working through the coach plumbing. Yes, I have and use the pump by-pass and think it is a good idea, but it is slow.
And finally, if one chooses to sanitize the system, it is easier to pour whatever (I use 20% H2O2) right into the tank.
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: [GMCnet] Gravity Water Fill Cap [message #311003 is a reply to message #310996] |
Sun, 27 November 2016 15:58 |
jknezek
Messages: 1057
Registered: December 2007
Karma: 5
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Ken Henderson wrote on Sun, 27 November 2016 14:50Jeremy,
I just can't understand why anyone would want to use gravity feed -- unless
they're dry camping and want to fill from a mountain stream or something.
Otherwise, sticking a water hose into a gravity port seems to me sort of
"old fashioned" -- not the thing for our MODERN coaches.
Guess I should try to remember what it was like to be young, with kids and
a job occupy my time, tho', instead of needing a GMC to find things to do
to, huh?
Ken H.
Because it is there, it works, it's quick, and it's simple? There are a lot of things I can work on with my GMC. In this case inventing a solution to a non-problem isn't high on the list. I like your idea Ken and I think you hit the nail on the head. If I was retired and had a lot of time to work on my GMC AND use my GMC those are the kind of projects I'd probably play with. But I don't have that time. So I spend the time I have working on things that need to be fixed or that I want improved (forever thankful for my macerator!) but I don't need to recreate the wheel when the round object I already have rolls pretty well.
I will say we were recently at Lake Fairfax Park in VA just outside D.C. The sites had 50 amp, but no sewer or water. So when you had to fill or dump, you had to go over to the dump station. The outlet for the fresh water had a hose that was rusted tight to the pump. Could I have gotten it off with some time and tools? Probably. But I didn't have the time to do it since we needed to be on our way to a funeral. The other end of the hose had no fitting. It wouldn't have been fun to fill without a gravity fill. Could have done it later that night when we got back by removing their hose and using my own, but my kids would have been up really late and Mom wouldn't have been happy.
And yes, the condition of their hose made me not want to use it. But needs must and we simply didn't use the water for anything but flushing and washing dishes, emptying the tank and refilling at our next stop.
Thanks,
Jeremy Knezek
1976 Glenbrook
Birmingham, AL
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| Re: [GMCnet] Gravity Water Fill Cap [message #311004 is a reply to message #310984] |
Sun, 27 November 2016 15:59 |
jknezek
Messages: 1057
Registered: December 2007
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bdub wrote on Sun, 27 November 2016 12:27Just go to home depot and get a 1-1/4" pipe cap. It might not screw on
perfectly but it will stay on. At least on the one's I've seen.
bdub
>
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This right here. How did I not think of this? Brilliant. Wish I didn't have 100 other things I needed to do today and could have tried this. Maybe tomorrow. That's the idea I'm looking for! Thanks Billy.
Thanks,
Jeremy Knezek
1976 Glenbrook
Birmingham, AL
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| Re: [GMCnet] Gravity Water Fill Cap [message #311009 is a reply to message #311004] |
Sun, 27 November 2016 18:45 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
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I've just led a sheltered life: While RVing since 1958, from Key West to
Fairbanks, PEI to LA, I've never found myself in a situation where I had to
use gravity feed.
I agree ya'll ought to have the capability! :-)
Ken H.
On Sun, Nov 27, 2016 at 4:59 PM, Jeremy wrote:
> bdub wrote on Sun, 27 November 2016 12:27
>> Just go to home depot and get a 1-1/4" pipe cap. It might not screw on
>> perfectly but it will stay on. At least on the one's I've seen.
>>
>> bdub
>>
>>
>>>
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>
> This right here. How did I not think of this? Brilliant. Wish I didn't
> have 100 other things I needed to do today and could have tried this. Maybe
> tomorrow. That's the idea I'm looking for! Thanks Billy.
>
> --
> Thanks,
> Jeremy Knezek
> 1976 Glenbrook
> Birmingham, AL
>
> _______________________________________________
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Gravity Water Fill Cap [message #311460 is a reply to message #310984] |
Sun, 11 December 2016 19:58 |
jknezek
Messages: 1057
Registered: December 2007
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bdub wrote on Sun, 27 November 2016 12:27Just go to home depot and get a 1-1/4" pipe cap. It might not screw on
perfectly but it will stay on. At least on the one's I've seen.
bdub
Finally got a chance to pick one of these up. 1.25" PVC threaded cap from Lowes not only fit perfectly, it had the right threads. Went on like it was made for the purpose. Less than a $2 solution that took no time since I was already on the way to Lowes for something else. Thanks Billy!!!!
Thanks,
Jeremy Knezek
1976 Glenbrook
Birmingham, AL
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| Re: Gravity Water Fill Cap [message #311461 is a reply to message #310942] |
Mon, 12 December 2016 02:21 |
Handyman
Messages: 229
Registered: April 2016
Location: The Netherlands
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Hello,
Here arround (europe) the gravity filling is quit common, build in the sidewall of the RV, or behind a hatch, on the other hand city water connections very rare.
We fill our drinking water with a hose, directly, or with a special cap which has a Gardena hose coupling on it.
http://members.ziggo.nl/d.w.jacobs/GMC/vuldop_met_gardena.jpg
And for some rare circumstances I always have a watering can of 10 liters, also when sanitaizing the system handy in use.
http://members.ziggo.nl/d.w.jacobs/GMC/SankeyGreen.jpg
And many times you have to use your own hose, what I consider, good, since you know the condition of that one ...
Daniel
Daniel Jacobs, NL-USA 1977 GMC Eleganza II, Rebuild 455 (2019) 3.55 FD. FiTech and (Modified) FCC, Electric Pump, insulated GasTanks, 100A Alternator, APC, McDash, Schräder Valves + extern Fills, Ceramic Film, TPMS, FlexSteel Seats
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| Re: [GMCnet] Gravity Water Fill Cap [message #311462 is a reply to message #311009] |
Mon, 12 December 2016 08:40 |
kstockwell
Messages: 367
Registered: May 2016
Location: Putney VT
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LOL, I've never used the city water hookup in any of my coaches though I guess it's been available a few times. It's all dry camping for me, so I fill up in the driveway, and refill as needed wherever I am, a cart, a bunch of 6 gallon containers and a little effort- or if I'm lucky a hose that reaches the gravity port.
Someday I'll get a transfer pump to make it easier.
kelly
78 kingsley
putney vt
Ken Henderson wrote on Sun, 27 November 2016 19:45I've just led a sheltered life: While RVing since 1958, from Key West to
Fairbanks, PEI to LA, I've never found myself in a situation where I had to
use gravity feed.
I agree ya'll ought to have the capability!
Ken H.
On Sun, Nov 27, 2016 at 4:59 PM, Jeremy wrote:
> bdub wrote on Sun, 27 November 2016 12:27
>> Just go to home depot and get a 1-1/4" pipe cap. It might not screw on
>> perfectly but it will stay on. At least on the one's I've seen.
>>
>> bdub
>>
>>
>>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> This right here. How did I not think of this? Brilliant. Wish I didn't
> have 100 other things I needed to do today and could have tried this. Maybe
> tomorrow. That's the idea I'm looking for! Thanks Billy.
>
> --
> Thanks,
> Jeremy Knezek
> 1976 Glenbrook
> Birmingham, AL
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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1978 Kingsley
Putney VT
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