| Re: [GMCnet] Vacuum pump problem/question [message #203522 is a reply to message #203514] |
Wed, 03 April 2013 12:14   |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma:
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Senior Member |
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Kerry,
Does your vacuum pump look like this one:
http://www.gmcmhphotos.com/photos/vacuum-pump-repair/p39177-vacuum-pump-fix.html
or
http://goo.gl/CtyB5
If so, it's supposed to go in series in the hose from the intake manifold
to the vacuum booster. So it will indeed blow back into the manifold, as
long as there's air to be exhausted from the booster -- just as the engine
should be doing when running.
Fact is, with your new booster, if still using the illustrated pump, you
shouldn't use the second booster port.
Ken H.
On Wed, Apr 3, 2013 at 12:30 PM, Kerry Pinkerton wrote:
>
>
> Paul and Nancy Doane visited last night and he drove my coach. I started
> asking some questions about vacuum and he noticed that while my coach ran
> great, the vacuum guage read a bit higher than his did. This morning
> before they left we did some poking and Paul noticed that when the vacuum
> pump came on, it blew back through the manifold and up through the carb.
> We pulled the booster vacuum line and sure enough when you press the brake
> pedal to trigger the pump, it blows back through the manifold vacuum line.
> ...
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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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