C3 Vette Registry - The Best Resource on the Net for C3 Vettes! C3 Vette
Forums -> C3 Fuel, Emission Control, and Exhaust Systems
Not Logged In! Login or Register!  Users Online: 19 / Help 
Features  Find C3 Parts on ebay in only 2 or 3 clicks!  | Add YOUR C3 to the Registry

Supporting Vendors
Mid America Motorworks
VetteBookStore.com
Volunteer Vette Products
Bair's Corvettes
CorvetteClothing.com

C3 of the Month
None Current
Enter Yours Today!
Online C3 Show
13
C3s are Registered

Vanity Plates
1FAST80
vetteonr
Featured Links
Chevrolet Corvette Restoration Guide


Buy Now
Corvette from the Inside
Corvette from the Inside


Corvette Masterpieces: Dream Cars You'd Love to Own (Hardcover)
Corvette Masterpieces: Dream Cars You'd Love to Own (Hardcover)


Motor Trend - $5 for 12 issues.
Motor Trend
Only $5 for 12 issues.


The Corvette Dynasty (Hardcover)
The Corvette Dynasty (Hardcover)



| Hide Signatures and Profile Pics

 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
9/17/13 11:08pm - Original Message: 'Choke pull off vacuum canister'
F4Gary Gold Member
Gold Member
- Send Private Message


Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 869
Should the vacuum canister on the right front of my carb hold a vacuum.  It's the choke pull off I think it's called.  I used my Mity Might vacuum tool to pull a vacuum on it and it sucks the diaphram in but it then leaks back out.  Should it hold a steady 10 or 15 inches of vacuum?
 Reply Reply  Quote Reply w/Quote
 
Support C3VR!
Suport our advertisers
9/18/13 6:25am - Reply: 'Re: Choke pull off vacuum canister'
Adams' Apple Lifetime Member
Lifetime Member
Moderator
- Send Private Message


Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19454
The pull-off valve has a "controlled" bleed, so it should not hold vacuum. It should bleed off slowly. If it bleeds quickly, it's prolly no good, but if it takes a few seconds to slowly release, it's ok. Thumbs Up

____________________________________
Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
 Reply Reply  Quote Reply w/Quote
9/18/13 10:40am - Reply: 'Re: Choke pull off vacuum canister'
F4Gary Gold Member
Gold Member
- Send Private Message


Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 869
Adams' Apple said: The pull-off valve has a "controlled" bleed, so it should not hold vacuum. It should bleed off slowly. If it bleeds quickly, it's prolly no good, but if it takes a few seconds to slowly release, it's ok. Thumbs Up


That's kinda what it does.  Pump it up to about 15 inches and it takes about 2 seconds to bleed off, it's not instantaneous.


____________________________________
 Reply Reply  Quote Reply w/Quote
9/18/13 12:05pm - Reply: 'Re: Choke pull off vacuum canister'
Adams' Apple Lifetime Member
Lifetime Member
Moderator
- Send Private Message


Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19454
2 seconds might be a little fast....Imma tinking more like 4-5, then slowly release... been so long since I worked on one, it's hard to remember....LOL
I'll look at some of my old stuff and see if I can find a spec for the pull-off.

A quick look here came up with this...no specs, but it does confirm there is a delay(bleed) in open/closing of the pull-off....



|UPDATED|9/18/2013 10:05:10 AM (AZT)|/UPDATED|


____________________________________
Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
 Reply Reply  Quote Reply w/Quote
9/18/13 1:53pm - Reply: 'Re: Choke pull off vacuum canister'
kstyer Lifetime Member
Lifetime Member
Moderator
- Send Private Message


CUYAHOGA FALLS, OH - USA

Vette(s):
1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!

Joined: 12/2/2003
Posts: 6410
General rule of thumb is if when you start the car it pulls right away, and maintains the position while running, it is probably okay.   If you open the 4 barrel you can expect it to drop due to lack of vacuum.
 
Following the specs is better.


____________________________________
On the "Tail of the Dragon"
(some day, no strike that, October 2008 it turned red, still in progress!)

(click either image to see a bigger version)
 Reply Reply  Quote Reply w/Quote
 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
 Forums -> C3 Fuel, Emission Control, and Exhaust Systems
(Moderator: Adam Wartell, Norsky, Adams' Apple, kstyer)
 

 
Official C3 Vette Registry Community:
Home | Forums | Email | Who's Online | Clubs | Events | Member Stats

Other Official C3 Vette Registry Areas:
Members | Research | Shop | My Account | About C3VR
 

Corvette is a registered trademark of the General Motors Corporation(GM) & Chevrolet Motor Division. Vette Registries, LLC is responsible for all site content (except for member submitted content or where otherwise noted) and does not claim or imply that Chevrolet or GM is responsible for Official C3 Vette Registry content. Vette Registries, LLC is independent from GM and is not affiliated with, sponsored or supported by GM.  Copyright/trademark/sales mark infringements are not intended, or implied and are in fact used to support GM, Chevrolet and Corvette

Official C3 Vette Registry content is Copyright 2001-2017, Vette Registries, LLC. Content may not be reused without written consent. All Rights Reserved. NS

Corvette (Vette) Model Years on this site: 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 30