| Living Area Water Pump 55 PSI Safe? [message #354690] |
Thu, 14 May 2020 09:16  |
Jeremy Sanford
Messages: 35
Registered: August 2018
Location: Sacramento CA
Karma: 1
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The living area water pump in my 77 Kingsley is a Shurflo 2088 with a build date of 5/99, the specs are 2.0 GPM and 45 PSI. The Shurflo pumps available now are either 2.3 GPM and 50 PSI or 3.0 GPM and 55 PSI. Is this too much PSI for the old plastic plumbing system in the GMC? The Maintenance Manual states "A pressure switch is located at the water pump to maintain line pressure between 15 psi. and 30 psi." The label of the original 1970s Shurflo pump is visible in one of the Maintenance Manual pictures and a rating of 3.5 GPM is listed (can't see the PSI rating).
Thanks!
Jeremy Sanford
Sacramento, CA
1977 Kingsley
http://www.gmcmhphotos.com/photos/u42733-jsanford.html
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| Re: [GMCnet] Living Area Water Pump 55 PSI Safe? [message #354693 is a reply to message #354692] |
Thu, 14 May 2020 12:29  |
Gerard Hickey
Messages: 53
Registered: June 2019
Karma: 1
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This is why one of my first projects last year when I got my MH was to
replace all the water lines. The couple of times I did use the MH last
year the water pump would turn on for a second or two every once in a
while. It was not really excessive, but a little bit annoying. I knew
that there was a little bit of a leak somewhere.
When I got started there was a little bit of water around the shutoff
valve right there inside the water pump compartment. My whole problem
was right there at the valve, but I did not know that until I had
completed everything else.
The actual work is not too bad and most of the work is in the bathroom
underneath the sink. You start by pulling the rear seat above the water
tank and opening up the water take compartment completely. You pretty
much have to remove the rear (exterior) wall to the bathroom. I found a
few other vent lines and overflow lines that needed to be replaced also
as they were looking pretty nasty and who knows what was growing inside.
I replaced every bit of water line with PEX and very happy that I did.
Saves me from worrying about hooking up to city water. I still use a
pressure regulator just in case and there are a few minor things that
were not replaced, but if they become problems it would not be difficult
to replace them too. The hardest part of the job is running the PEX
tubing above the ceiling. Most of that is just having enough hands to
help with pushing and pulling the tubing. To make it much easier I used
flexible sink hookups at each sink and at each end of the run through
the ceiling. Trying to get the crimp tool in some of the tight spaces is
pretty ugly so the flex connections are pretty much necessary.
The one real mistake that I made was that I built the PEX tubing
assembly for under the bathroom sink outside of the compartment. Pretty
much have to--remember tight spaces where the crimp can not go. That all
went pretty good. What I failed to think about is that the toilet paper
storage goes back in and extends some amount of inches into the space
where the plumbing is. So I have that storage wall pressing up against
the PEX tubing and pushing on it some. Not much so I am fine, so I
lucked out. But for anyone else that is looking at replacing all the
plumbing, keep that in mind.
Oh and what was the real problem that started my crazy endeavor? There
were small plastic adapters that go from 1/2 inch thread to 3/4 inch
thread on either side of the shutoff valve that had very small cracks.
They were leaking a bit. There is also one at the city water inlet. I
think that had the same problem too.
The check valves are pretty much crap too after 40 years, so replace
them also. There is one at the shutoff valve and one at the top of the
line to the shower head. Get rid of the plastic ones and replace them
with the brass ones that Campco sells. You will not have to worry about
them ever again.
--
Gerard Hickey / WTØF IRLP:3067/Echolink:529661
hickey@kinetic-compute.com DMR: 3102272
425-395-4554
On 5/14/20 9:22 AM, James Hupy via Gmclist wrote:
> It only takes one instance of hooking up to city water without a pressure
> regulator in the hose line to convince you that hooking up to City water
> pressure is a bad idea.
> I would for SURE never use more than about 40 psi in a 40 year old
> water system in a GMC. Even then, you need to leak check everything in the
> system, and turn off the pump when not in use.
> Jim Hupy
> Salem, Oregon
>
> On Thu, May 14, 2020, 9:01 AM roy keen via Gmclist
> wrote:
>
>> I’d feel a lot better with 30 or even 45
>> --
>> Roy Keen
>> Minden,NV
>> 76 X Glenbrook
>>
>> _______________________________________________
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| Re: Living Area Water Pump 55 PSI Safe? [message #354695 is a reply to message #354690] |
Thu, 14 May 2020 13:11 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Jeremy Sanford wrote on Thu, 14 May 2020 10:16The living area water pump in my 77 Kingsley is a Shurflo 2088 with a build date of 5/99, the specs are 2.0 GPM and 45 PSI. The Shurflo pumps available now are either 2.3 GPM and 50 PSI or 3.0 GPM and 55 PSI. Is this too much PSI for the old plastic plumbing system in the GMC? The Maintenance Manual states "A pressure switch is located at the water pump to maintain line pressure between 15 psi. and 30 psi." The label of the original 1970s Shurflo pump is visible in one of the Maintenance Manual pictures and a rating of 3.5 GPM is listed (can't see the PSI rating).
Thanks!
Jeremy,
When these coaches were built, they had to meet BOCA code. There should be a plaque next to the door that states this. City water pressures can be as high as 70psi in some locations. Ergo, even with the 45yo plastic plumbing, I would doubt that it would fail at 55psi. But, if that is a risk you don't want to take, there is an adjustment in the front of most Shurflos to set the shut off pressure.
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: Living Area Water Pump 55 PSI Safe? [message #354700 is a reply to message #354690] |
Thu, 14 May 2020 19:51 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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I have the shut off pressure on my GMC set to 50 and it usually goes a few PSI higher. I do the same with my water wells at home and my hangar at the airport. Why? Because I also have pressure (accumulator) tanks and the higher max pressure allows me so store a little more water before turning on the pump again.
I have no problems with 50 or 55 PSI max pressure in the water system. If your 40 year old hose / lines are too rotten for that, then replace them.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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