Home » Public Forums » GMCnet » aux vac pump
| aux vac pump [message #107942] |
Wed, 08 December 2010 18:05  |
jayrabe
Messages: 509
Registered: June 2009
Location: Portland, OR
Karma: 0
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Senior Member |
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Emboldened by my recent success with the header gasket, I'm digging into installing the JC4 aux vac pump that's been sitting in a box since buying it 9 mo ago. Funny how time slips by...
Anyway, can't seem to find 1/2" vac hose. NAPA doesn't carry it, and the helpful counter person called 3 other places in town and nada, other than buying a 100' roll. Uh, more than I need.
I'm trying to mount it hanging from the brake booster as such:
http://www.gmcmhphotos.com/photos/showphoto.php?photo=37149&title=vac-pump-01&cat=5671
So first question, any idea where can I get a foot or so of 1/2" vac hose?
OTOH I've seen an alternative mounting on Gene Fisher's site:
http://www.gmcmhphotos.com/photos/showphoto.php?photo=36461&title=work-s-pump-mount-small-&cat=4896
where you just plug the pump directly into the booster. So now the second question: Can't figure out how to get the fitting off the booster. Don't want to pry and break something (like that never happens) and couldn't see any slots or clips or whatever.
Help. and Thanks!
J
76 PB
Portland, OR
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| Re: [GMCnet] aux vac pump [message #107945 is a reply to message #107942] |
Wed, 08 December 2010 18:19  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Jay, try Baxter Auto Parts. If they cant help you, call me & I'll help you
locate some.
Jim Hupy
Salem, Or
78 Royale 403
On Wed, Dec 8, 2010 at 4:05 PM, Jay Rabe <jayrabe@hotmail.com> wrote:
>
>
> Emboldened by my recent success with the header gasket, I'm digging into
> installing the JC4 aux vac pump that's been sitting in a box since buying it
> 9 mo ago. Funny how time slips by...
>
> Anyway, can't seem to find 1/2" vac hose. NAPA doesn't carry it, and the
> helpful counter person called 3 other places in town and nada, other than
> buying a 100' roll. Uh, more than I need.
>
> I'm trying to mount it hanging from the brake booster as such:
>
> http://www.gmcmhphotos.com/photos/showphoto.php?photo=37149&title=vac-pump-01&cat=5671
>
> So first question, any idea where can I get a foot or so of 1/2" vac hose?
>
> OTOH I've seen an alternative mounting on Gene Fisher's site:
>
> http://www.gmcmhphotos.com/photos/showphoto.php?photo=36461&title=work-s-pump-mount-small-&cat=4896
> where you just plug the pump directly into the booster. So now the second
> question: Can't figure out how to get the fitting off the booster. Don't
> want to pry and break something (like that never happens) and couldn't see
> any slots or clips or whatever.
>
> Help. and Thanks!
>
> J
> 76 PB
> Portland, OR
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: [GMCnet] aux vac pump [message #107968 is a reply to message #107962] |
Wed, 08 December 2010 23:35 |
jayrabe
Messages: 509
Registered: June 2009
Location: Portland, OR
Karma: 0
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Thanks. Yeah, at Jim Hupy's suggestion I called Baxter, and they didn't have 1/2" "vacuum hose", but they do have a "heater hose" that is 1/2" and is very thick wall and should work.
Also, JimK, no, I didn't tighten the offset bolt on the header flange. Got that clear from the net comments before I started. Thanks. :-)
J
> To: gmclist@temp.gmcnet.org
> From: halkading@fastwave.biz
> Date: Wed, 8 Dec 2010 22:14:39 -0600
> Subject: Re: [GMCnet] aux vac pump
>
>
>
> Jay,
>
> Most hardware stores have reinforced vinyl hose in half inch. It will work good in an application like this.
>
> Hal Kading 77 Kingsley 455 Las Cruces NM
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
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| Re: [GMCnet] aux vac pump [message #107972 is a reply to message #107968] |
Thu, 09 December 2010 02:25 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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| jayrabe wrote on Wed, 08 December 2010 21:35 |
... they didn't have 1/2" "vacuum hose", but they do have a "heater hose" that is 1/2" and is very thick wall and should work. ...
|
I would be concerned about heater hose collapsing under vacuum. Anyone know if this is a problem?
If you can mount the JC4 pump directly into the booster, you shouldn't need to add much (if any) vacuum hose. The JC4 was designed to be used that way.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: aux vac pump [message #108000 is a reply to message #107942] |
Thu, 09 December 2010 11:57 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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Senior Member |
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If all else fails why not get what you need at the local wrecking yard.
Roy
Roy Keen
Minden,NV
76 X Glenbrook
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| Re: [GMCnet] aux vac pump [message #108001 is a reply to message #107999] |
Thu, 09 December 2010 11:56 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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J,
The "swivel fitting" on the booster is actually a check valve. There's just
a barbed fitting holding it in the grommet. Pull it straight out. May take
considerable force, barbed fittings being what they are, and the grommet
perhaps old and hardened. You may want to get a new grommet from the "Help"
rack at the parts store.
HTH,
Ken H.
On Thu, Dec 9, 2010 at 12:30 PM, Jay Rabe <jayrabe@hotmail.com> wrote:
>
> Thanks Mike, yeah, that's what I think I want to do. Shouldn't need any
> 1/2" hose doing it that way.
>
> But I still don't know how to get the swivel fitting off of the booster to
> connect the pump. Any tips?
>
> J
> 76 PB
> Portland, OR
>
> ------------------
> > If you can mount the JC4 pump directly into the booster, you shouldn't
> need to add much (if any) vacuum hose. The JC4 was designed to be used that
> way.
> > Mike Miller
>
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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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] aux vac pump [message #108008 is a reply to message #107999] |
Thu, 09 December 2010 13:00 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Jay, spray the connector with WD-40 & pull straight out on it. It takes a
pretty good pull, but don't bend it up & down or you might break it. New
ones are available.
Jim Hupy
Salem, Or
78 Royale 403
On Thu, Dec 9, 2010 at 9:30 AM, Jay Rabe <jayrabe@hotmail.com> wrote:
>
> Thanks Mike, yeah, that's what I think I want to do. Shouldn't need any
> 1/2" hose doing it that way.
>
> But I still don't know how to get the swivel fitting off of the booster to
> connect the pump. Any tips?
>
> J
> 76 PB
> Portland, OR
>
> ------------------
> > If you can mount the JC4 pump directly into the booster, you shouldn't
> need to add much (if any) vacuum hose. The JC4 was designed to be used that
> way.
> > Mike Miller
>
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: [GMCnet] aux vac pump [message #108057 is a reply to message #107962] |
Thu, 09 December 2010 20:50 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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If you need some 1/2" vac hose, I can cut you off some and send it to you n/c.
Lookn it this way, as a major repair shop, we inventory these slow
moving parts that parts place refuse to stock.
We supply lot of people with basic parts that are not stocked by
majority of the parts houses.
On Wed, Dec 8, 2010 at 8:14 PM, Hal Kading <halkading@fastwave.biz> wrote:
>
>
> Jay,
>
> Most hardware stores have reinforced vinyl hose in half inch. It will work good in an application like this.
>
> Hal Kading 77 Kingsley 455 Las Cruces NM
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: aux vac pump [message #108069 is a reply to message #108056] |
Thu, 09 December 2010 22:05 |
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philipswanson wrote on Thu, 09 December 2010 18:29]The problem is that you should not be using vacuum hose on a brake booster system. What you need is DOT approved brake booster hose which comes in 1/2 inch. Go back to Napa and tell them you want DOT brake booster line. Brake booster hose has more thread, is more rigid and is impervious to brake fluids. That is why DOT has a spec for it. NEVER put vacuum line on a brake booster system. Auto Shop 101.
Phil Swanson
77GMCPB [/quote]
Wow Phil, thanks, that is good info; I'm going to have to change my vacuum pump connection now.
geo groth '73 260 Sequoia
Carson City Nevada 89703
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| Re: aux vac pump [message #108161 is a reply to message #108056] |
Fri, 10 December 2010 23:48 |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
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Senior Member |
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| philipswanson wrote on Thu, 09 December 2010 18:29 |
The problem is that you should not be using vacuum hose on a brake booster system. It is flat illegal, that is why they don't sell it. What you need is DOT approved brake booster hose which comes in 1/2 inch. Go back to Napa and tell them you want DOT brake booster line. Vacuum hose will collapse internally with the high vacuum in a booster system. Brake booster hose has more thread, is more rigid and is impervious to brake fluids. That is why DOT has a spec for it. NEVER put vacuum line on a brake booster system. Auto Shop 101.
Phil Swanson
77GMCPB
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Well, I guess I get to do that over. I just put 1/2 inch heater type hose on the new pump I installed... today. Humph.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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| Re: [GMCnet] aux vac pump [message #108178 is a reply to message #108165] |
Sat, 11 December 2010 08:55 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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| Mr ERFisher wrote on Sat, 11 December 2010 07:02 |
2 inches of this hose is not going to cause you any problems. but to CYA ,you can change it at your convenience.
There are lots of systems on the GMC that might not be ----up to DOT,---legal ---- etc.
vacuum booster pump (not stock- but life saving)
disk brakes
parking brake / emergency brake
air bag replacements and controllers
NSS by-pass
smog compliance
tinted windows
etc
these decisions,and others are your decision to implement, but, they are a way of life for the GMC.
gene
|
When Libby Dole was Sec of Trans, the vast majority of regulations were rewritten to be minimum standards only. So:
- A vacuum booster pump is not covered at all
- Upgrading brakes is not an issue as long as DOT spec parts are used in the actual brake systems
- Parking Brakes are required in most states, but if there is no vehicle inspection required, who will know? (These have not been an emergency brake for decades.)
- Suspension components again have only minimum standards
- Neutral Safety Switches were include in automatic transmission vehicles long before any DOT or NVSS rules and now they are many other types of interlocks included ahead of standards
- Smog compliance is EPA not DOT or overruled by state regs. Only California is so S-Brain Stupid to not allow passage of systems that improve on the original without jumping a room full of flaming hoops.
- Tinted windows is only an issue if you tint the cab windows. Legally - everything behind the cab is house and the tinted window rules for vehicles do not apply.
The vast majority of changes we might make to our coaches are not covered by anything other than our own interest in self preservation. If there was any way I could afford the cost, I would fit my coach with all wheel anti-lock disk brakes tomorrow.
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] aux vac pump [message #108180 is a reply to message #108178] |
Sat, 11 December 2010 09:03 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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yep
as always, make your own choices -
have no fear
JWID
gene
On Sat, Dec 11, 2010 at 6:55 AM, Matt Colie <mcolie@chartermi.net> wrote:
>
>
> Mr ERFisher wrote on Sat, 11 December 2010 07:02
> > 2 inches of this hose is not going to cause you any problems. but to CYA
> ,you can change it at your convenience.
> >
> > There are lots of systems on the GMC that might not be ----up to
> DOT,---legal ---- etc.
> >
> > vacuum booster pump (not stock- but life saving)
> > disk brakes
> > parking brake / emergency brake
> > air bag replacements and controllers
> > NSS by-pass
> > smog compliance
> > tinted windows
> > etc
> >
> > these decisions,and others are your decision to implement, but, they are
> a way of life for the GMC.
> >
> > gene
>
> When Libby Dole was Sec of Trans, the vast majority of regulations were
> rewritten to be minimum standards only. So:
> - A vacuum booster pump is not covered at all
> - Upgrading brakes is not an issue as long as DOT spec parts are used in
> the actual brake systems
> - Parking Brakes are required in most states, but if there is no vehicle
> inspection required, who will know? (These have not been an emergency brake
> for decades.)
> - Suspension components again have only minimum standards
> - Neutral Safety Switches were include in automatic transmission vehicles
> long before any DOT or NVSS rules and now they are many other types of
> interlocks included ahead of standards
> - Smog compliance is EPA not DOT or overruled by state regs. Only
> California is so S-Brain Stupid to not allow passage of systems that improve
> on the original without jumping a room full of flaming hoops.
> - Tinted windows is only an issue if you tint the cab windows. Legally -
> everything behind the cab is house and the tinted window rules for vehicles
> do not apply.
>
> The vast majority of changes we might make to our coaches are not covered
> by anything other than our own interest in self preservation. If there was
> any way I could afford the cost, I would fit my coach with all wheel
> anti-lock disk brakes tomorrow.
>
> Matt
>
> --
> Matt & Mary Colie
> '73 Glacier 23 Chaumiere (say show-me-air)
> SE Michigan - DTW 3.2/4R
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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