Home » Public Forums » GMCnet » Air Pressure Regulator
| Air Pressure Regulator [message #142067] |
Fri, 02 September 2011 00:30  |
Jiffyjet2
Messages: 86
Registered: November 2008
Karma: 0
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On our second outing in the Pumpkin, I tried to raise the rear end to level the coach and waited for the pump to cut in and do it's thing. No action, so a quick look under the hood revealed a melted inline 30 amp fuse. I took the fuse block out and direct wired it and it started pumping...and pumping...and pumping, even though the pressure was about 140. I rapped on the Penn regulator with the end of my flash light, and it quit. Obviously, the regulator is sticking. This regulator is the original type that used to bolt on top of the pump, however, the PO changed the pump for a red colored Super Flow MV-50. I have a new Viair from Jim K and a new regulator, however, I'd like to keep this system working 'til the weather changes before I redo the air system. My question is this. Can the Penn regulator be fixed, or is it just a waste of time?
Thanks
Jess
'74 Canyonlands
"the Great Pumpkin"
Tacoma, Washington
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| Re: Air Pressure Regulator [message #142070 is a reply to message #142067] |
Fri, 02 September 2011 00:58  |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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New regulators are cheap. Just go to McMaster Carr, order one, and install it.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Air Pressure Regulator [message #142089 is a reply to message #142067] |
Fri, 02 September 2011 09:01 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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| Jiffyjet2 wrote on Fri, 02 September 2011 01:30 |
On our second outing in the Pumpkin, I tried to raise the rear end to level the coach and waited for the pump to cut in and do it's thing. No action, so a quick look under the hood revealed a melted inline 30 amp fuse. I took the fuse block out and direct wired it and it started pumping...and pumping...and pumping, even though the pressure was about 140. I rapped on the Penn regulator with the end of my flash light, and it quit. Obviously, the regulator is sticking. This regulator is the original type that used to bolt on top of the pump, however, the PO changed the pump for a red colored Super Flow MV-50. I have a new Viair from Jim K and a new regulator, however, I'd like to keep this system working 'til the weather changes before I redo the air system. My question is this. Can the Penn regulator be fixed, or is it just a waste of time?
Thanks
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Jess,
That is not called a regulator. It is called a pressure switch or a compressor control switch.
Can it can it be fixed?
Probably, but it is not worth messing with.
Grainger 5B419 - 23.12
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] Air Pressure Regulator [message #142101 is a reply to message #142067] |
Fri, 02 September 2011 11:38 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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There was no regulator in the air system on the on the GMC. There was
a pressure switch that is supposed to turn the compressor on and
off. The typical set point was on at 95 psi and off ant aprox 125
psi. The pressure switch is available at most hardware store and
GMCMI newsletter has several articles on them, see I45,P3, I46, P3 and
I63.P4 (That is issue and Page)
Grainger list this pressure switch which is commonly available at your
hardware store also. This is the one that I have seen in most coaches
<http://www.grainger.com/Grainger/wwg/search.shtml?searchQuery=3x682&op=search&Ntt=3x682&N=0&sst=subset
>
J.R. Wright
GMC GreatLaker
Newsletter Editor/Publisher
78 Buskirk 30' Stretch
75 Avion (Under Reconstruction)
Michigan
On Sep 2, 2011, at 1:30 AM, Jiffyjet2 wrote:
>
>
> On our second outing in the Pumpkin, I tried to raise the rear end
> to level the coach and waited for the pump to cut in and do it's
> thing. No action, so a quick look under the hood revealed a melted
> inline 30 amp fuse. I took the fuse block out and direct wired it
> and it started pumping...and pumping...and pumping, even though the
> pressure was about 140. I rapped on the Penn regulator with the end
> of my flash light, and it quit. Obviously, the regulator is
> sticking. This regulator is the original type that used to bolt on
> top of the pump, however, the PO changed the pump for a red colored
> Super Flow MV-50. I have a new Viair from Jim K and a new
> regulator, however, I'd like to keep this system working 'til the
> weather changes before I redo the air system. My question is this.
> Can the Penn regulator be fixed, or is it just a waste of time?
> Thanks
>
> --
> Jess
> '74 Canyonlands
> "the Great Pumpkin"
> Tacoma, Washington
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
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Unsubscribe or Change List Options:
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: Air Pressure Regulator [message #142103 is a reply to message #142067] |
Fri, 02 September 2011 11:50 |
idrob
Messages: 645
Registered: January 2005
Location: Central Idaho
Karma: 0
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| Jiffyjet2 wrote on Thu, 01 September 2011 22:30 |
On our second outing in the Pumpkin, I tried to raise the rear end to level the coach and waited for the pump to cut in and do it's thing. No action, so a quick look under the hood revealed a melted inline 30 amp fuse. I took the fuse block out and direct wired it and it started pumping...and pumping...and pumping, even though the pressure was about 140. I rapped on the Penn regulator with the end of my flash light, and it quit. Obviously, the regulator is sticking. This regulator is the original type that used to bolt on top of the pump, however, the PO changed the pump for a red colored Super Flow MV-50. I have a new Viair from Jim K and a new regulator, however, I'd like to keep this system working 'til the weather changes before I redo the air system. My question is this. Can the Penn regulator be fixed, or is it just a waste of time?
Thanks
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Look here for the adjustments on an original Penn pressure switch. But, as others have said, not very expensive to simply replace it.
http://www.gmcmhphotos.com/photos/showphoto.php?photo=15410&cat=4335
Rob Allen
former owner of '76 x-PB
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| Re: Air Pressure Regulator [message #142118 is a reply to message #142079] |
Fri, 02 September 2011 14:42 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Same thing. Get one with the unloader. They are about $2.00 extra. You can use the unloader or forget it. Also you can install it now and connect up the unloader later. It is only one hose connection.
Ken
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Air Pressure Regulator [message #142130 is a reply to message #142115] |
Fri, 02 September 2011 15:40 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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| Jiffyjet2 wrote on Fri, 02 September 2011 12:15 |
Thanks for all the info. As I said in my querie, I have a new pump and pressure switch from Jim K as well as a new stainless tank, filter, relief valve, separator, etc. But I want to put off completely redoing the system for a few months and just wanted to know if there was a bandage I could apply to the Penn to get a few more trips out of it. Looks I'll just have to keep a hammer handy in case the Penn sticks again! 
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Jess,
It is not a big job to change out the pressure switch. There is no reason you can't do that now, then take it back off and switch it to your new tank later.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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