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[GMCnet] What did this GM vacuum pump originally come on? [message #313743]

Fri, 24 February 2017 17:30

BobDunahugh

Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA

Karma: 11

Senior Member

I bought it at a GMCMI event. My problem is that I didn't think about the fact that the wiring plug wasn't there. And I don't know what it came on to find out how to wire it. The 4 terminals are labeled A B C D. The part number on the end is 5048679. There are two ports. With one labeled outlet on a funnel shaped piece. Does the outlet port go to the brake booster?
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Re: [GMCnet] What did this GM vacuum pump originally come on? [message #313745 is a reply to message #313743]

Fri, 24 February 2017 17:59

tphipps

Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL

Karma: 9

Senior Member

Bob, Can you put power to it and identify which port performs which function? Perhaps a photo might help someone identify it from men's mall shopping trips.
Tom, MS II

2012 Phoenix Cruiser model 2552 KA4CSG

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Re: [GMCnet] What did this GM vacuum pump originally come on? [message #313747 is a reply to message #313743]

Fri, 24 February 2017 18:22

Emery Stora

Messages: 959
Registered: January 2011

Karma: 4

Senior Member

Bob
That is a pump that many of us used a few years back.
They can be found on the following vehicles (it is
hid under the battery tray on the
drivers side)
Buick Skyhawk (Body style J) -1982
Buick Skyhawk (Body style X) - Years 82
Chevy Celebrity (Body style A)  Years 84-86
Chevy Caprice (Body style B) 1982
Chevy Cavalier (Body style J) 1982
Chevy Citation (Body style X) Years 82-85
Olds Cierra (Body style A) 1986
Olds Firenza (Body style J) 1982
Olds Omega (Body style X) Years 82-84
Pontiac 6000 (Body style A) Years 85-86
Pontiac J2000 (Body style J) 1982
Pontiac Phoenix (Body style X) Years 82-84

I found that it was also used by Volvo volvo --760-GLE TURBO (GAS) --1985 and 1987. Thet are located under the hood riht on top of the engine on the driver’s side.

If you can find one of the old cars you should be able to get the plug you need. You want the suction port to go to the booster and the other (I assume it would be called the outlet) to the manifold on the engine.

One problem with this pump is that it really doesn’t put out enough vacuum for the GMC motorhome.
I switched to the Long pump which was from a Ford electric car (Azure) but that pump is no longer available. That pump puts out a lot more vacuum.

Emery Stora
>
> Bob Dunahue posted:
> I bought it at a GMCMI event. My problem is that I didn't think about the fact that the wiring plug wasn't there. And I don't know what it came on to find out how to wire it. The 4 terminals are labeled A B C D. The part number on the end is 5048679. There are two ports. With one labeled outlet on a funnel shaped piece. Does the outlet port go to the brake booster?
> _______________________________________________

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[GMCnet] Fwd: What did this GM vacuum pump originally come on? [message #313749 is a reply to message #313747]

Fri, 24 February 2017 19:01

emerystora

Messages: 4442
Registered: January 2004

Karma: 13

Senior Member

That should have read "Lenzi" pump, not "Long" pump.

Emery

Begin forwarded message:

> From: Emery Stora
> Date: February 24, 2017 at 5:22:37 PM MST
> To: gmclist@list.gmcnet.org
> Subject: Re: [GMCnet] What did this GM vacuum pump originally come on?
> Reply-To: gmclist@list.gmcnet.org
>
> Bob
> That is a pump that many of us used a few years back.
> They can be found on the following vehicles (it is
> hid under the battery tray on the
> drivers side)
> Buick Skyhawk (Body style J) -1982
> Buick Skyhawk (Body style X) - Years 82
> Chevy Celebrity (Body style A)  Years 84-86
> Chevy Caprice (Body style B) 1982
> Chevy Cavalier (Body style J) 1982
> Chevy Citation (Body style X) Years 82-85
> Olds Cierra (Body style A) 1986
> Olds Firenza (Body style J) 1982
> Olds Omega (Body style X) Years 82-84
> Pontiac 6000 (Body style A) Years 85-86
> Pontiac J2000 (Body style J) 1982
> Pontiac Phoenix (Body style X) Years 82-84
>
> I found that it was also used by Volvo volvo --760-GLE TURBO (GAS) --1985 and 1987. Thet are located under the hood riht on top of the engine on the driver’s side.
>
> If you can find one of the old cars you should be able to get the plug you need. You want the suction port to go to the booster and the other (I assume it would be called the outlet) to the manifold on the engine.
>
> One problem with this pump is that it really doesn’t put out enough vacuum for the GMC motorhome.
> I switched to the Long pump which was from a Ford electric car (Azure) but that pump is no longer available. That pump puts out a lot more vacuum.
>
> Emery Stora
>>
>> Bob Dunahue posted:
>> I bought it at a GMCMI event. My problem is that I didn't think about the fact that the wiring plug wasn't there. And I don't know what it came on to find out how to wire it. The 4 terminals are labeled A B C D. The part number on the end is 5048679. There are two ports. With one labeled outlet on a funnel shaped piece. Does the outlet port go to the brake booster?
>> _______________________________________________
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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Re: [GMCnet] Fwd: What did this GM vacuum pump originally come on? [message #313750 is a reply to message #313749]

Fri, 24 February 2017 20:14

Bruce Hart

Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming

Karma: 5

Senior Member

Bob,
As luck would have it you can build your own connector;-)

Napa #s
725267
https://www.napaonline.com/napa/en/p/NW_725267/NW_725267
725170
https://www.napaonline.com/napa/en/p/NW_725170/NW_725170
725152
https://www.napaonline.com/napa/en/p/NW_725152/NW_725152

http://gmcmotorhome.info/figs/vacpump/vac.html

This is what you were looking for:

Connection A (Red wire) battery positive, 12 volts+ through a fuse.
Connection B (Black with white stripe) ignition positive, 12 volts+
Connection C (plugged) not used (not used in factory system either)
Connection D (Black wire) ground, 12 volts-
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Bruce Hart 1976 Palm Beach 1977 28' Kingsley La Grange, Wyoming

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Re: [GMCnet] What did this GM vacuum pump originally come on? [message #313758 is a reply to message #313743]

Fri, 24 February 2017 22:57

BobDunahugh

Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA

Karma: 11

Senior Member

PERFECT. THANK YOU SO MUCH gentlemen. I'm on a mission that if I got it around. Get it on. Thus not getting lost, and off the shelf. Bob Dunahugh
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Re: [GMCnet] What did this GM vacuum pump originally come on? [message #313777 is a reply to message #313743]

Sat, 25 February 2017 09:56

JohnL455

Messages: 4447
Registered: October 2006
Location: Woodstock, IL

Karma: 12

Senior Member

Gotta say that's some perfect examples of great information networking including what it was used on and the Pinout.

John Lebetski
Woodstock, IL
77 Eleganza II

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Re: [GMCnet] What did this GM vacuum pump originally come on? [message #313805 is a reply to message #313747]

Sat, 25 February 2017 21:54

thesmith

Messages: 589
Registered: February 2015
Location: Cary, NC

Karma: 6

Senior Member

"I switched to the Long pump which was from a Ford electric car (Azure) but that pump is no longer available. That pump puts out a lot more vacuum.

Emery Stora"

Could you run two of the GM ones in parallel? Twice the vacuum and maybe redundancy as well?

Pete

Cary, NC 1978 Center Kitchen Royale.

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Re: [GMCnet] What did this GM vacuum pump originally come on? [message #313809 is a reply to message #313805]

Sat, 25 February 2017 22:33

emerystora

Messages: 4442
Registered: January 2004

Karma: 13

Senior Member

That would help the recovery time but the extra degree of vacuum, about 3" more vacuum, gives more braking so two pumps would not give a lower vacuum than one pump

Emery Stora
77 Kingsley
Frederick, CO

> On Feb 25, 2017, at 8:54 PM, Pete Smith wrote:
>
>
>
> "I switched to the Long pump which was from a Ford electric car (Azure) but that pump is no longer available. That pump puts out a lot more vacuum.
>
> Emery Stora"
>
>
> Could you run two of the GM ones in parallel? Twice the vacuum and maybe redundancy as well?
>
> Pete
>
>
>
>
> --
> Cary, NC
>
> No Coach yet but likely center kitchen, dry side bath Royale, 78, 403, hopefully with good original white Imron paint.
>
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Re: [GMCnet] What did this GM vacuum pump originally come on? [message #313840 is a reply to message #313805]

Sun, 26 February 2017 18:42

Ken Henderson

Messages: 8726
Registered: March 2004
Location: Americus, GA

Karma: 9

Senior Member

IMHO, the way to use the old GM vacuum pumps is to install them between the
engine and a vacuum reservoir (30" of 4" PVC in the rear of the #1 front
crossmember), with that reservoir supplying vacuum to the booster.

That way, the vacuum stored in the booster, and another 3 applications in
the reservoir, will begin at the highest vacuum last created by the engine
during deceleration, but never lower than what the pump is capable of
creating.

Ken H.

On Sat, Feb 25, 2017 at 10:54 PM, Pete Smith wrote:

>
> Could you run two of the GM ones in parallel? Twice the vacuum and maybe
> redundancy as well?
>
> Pete
>
>
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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] What did this GM vacuum pump originally come on? [message #313841 is a reply to message #313840]

Sun, 26 February 2017 18:46

Mr ERFisher

Messages: 7117
Registered: August 2005

Karma: 2

Senior Member

But only good for one pump.
On Sun, Feb 26, 2017 at 4:43 PM Ken Henderson
wrote:

> IMHO, the way to use the old GM vacuum pumps is to install them between the
> engine and a vacuum reservoir (30" of 4" PVC in the rear of the #1 front
> crossmember), with that reservoir supplying vacuum to the booster.
>
> That way, the vacuum stored in the booster, and another 3 applications in
> the reservoir, will begin at the highest vacuum last created by the engine
> during deceleration, but never lower than what the pump is capable of
> creating.
>
>
> Ken H.
>
>
> On Sat, Feb 25, 2017 at 10:54 PM, Pete Smith wrote:
>
>>
>> Could you run two of the GM ones in parallel? Twice the vacuum and maybe
>> redundancy as well?
>>
>> Pete
>>
>>
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--
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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Re: [GMCnet] What did this GM vacuum pump originally come on? [message #313843 is a reply to message #313743]

Sun, 26 February 2017 19:22

jhbridges

Messages: 8412
Registered: May 2011
Location: Braselton ga

Karma: -74

Senior Member

By test, my reservoir is good for three stops with no engine. Since the NO is going to hook up the power to the pump, we'll have to ask him how it does with the pump running. I suspect it will keep you from hitting things.

--johnny

NO = New Owner

Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons. Braselton, Ga. I forgive them all, save those who hurt the dogs. They must answer to me in hell

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