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Old 03-11-2013, 12:42 AM   #1
Ornery37
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QuadraJet questions

I have spent several hours searching and I have found every vacuum port except these two. I bought this as a reman. do not know the year. I have 5 ports in front, 3 on the rear, and then the large one off the canister/diaphragm. #1 top center rear and #2 the one off the canister/diaphragm.
any help appreciated
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Last edited by Ornery37; 03-11-2013 at 12:44 AM. Reason: front photo
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Old 03-11-2013, 12:59 AM   #2
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Re: QuadraJet questions

any help?

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Old 03-11-2013, 01:06 AM   #3
Ornery37
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Re: QuadraJet questions

Hey Gumby, yes some, #7 I am assuming that goes to the charcol canister that I have been reading about so I can cap it off?
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1964 long fleet bed large rear window (project)(sold)
1965 chevy short fleet large rear window bagged (project)(thinking crew cab)
1965 chevy short fleet (driver/worktruck)
1937 chevy fenderless pu (use to be daily driver)
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Old 03-11-2013, 01:10 AM   #4
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Re: QuadraJet questions

#4 is the charcal canister/canister purge, #7 is vacuum resivor, funky round black orb on some rides, it can be capped off. [think its there to hold some vacuum for the HVAC controls, the orb that is]
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Old 03-11-2013, 01:16 AM   #5
Ornery37
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Re: QuadraJet questions

thankyou so very much! now I just have to figure out the secondary diaphragm? with the large port on the rear. Cause it already has the small port on the side that goes to the back of the carb.
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1964 long fleet bed large rear window (project)(sold)
1965 chevy short fleet large rear window bagged (project)(thinking crew cab)
1965 chevy short fleet (driver/worktruck)
1937 chevy fenderless pu (use to be daily driver)
1983 MB turbo diesel (daily)
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Old 03-11-2013, 01:22 AM   #6
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Re: QuadraJet questions

well pics are all of BOP qjets, so its only abour 98% the same.




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Old 03-11-2013, 02:00 AM   #7
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Re: QuadraJet questions

passenger side of the carb
#1 points to the electric choke
#2 points to the (secondary choke diaphragm?) and the connection from the side of it to the bottom of the carb.

but this (#3) is the only (secondary choke diaphragm?) "thing-a-ma-gig" that has a large hose fitting off the back.
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1964 long fleet bed large rear window (project)(sold)
1965 chevy short fleet large rear window bagged (project)(thinking crew cab)
1965 chevy short fleet (driver/worktruck)
1937 chevy fenderless pu (use to be daily driver)
1983 MB turbo diesel (daily)
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Old 03-11-2013, 02:27 AM   #8
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Re: QuadraJet questions

did some more searching and the assembly circled in the post above, some are calling "choke pull off" others are calling it a "choke vacuum diaphragm". but no explanation why the one on mine has the small port that goes to the bottom of the carb and the large one off the rear of the (that I have plugged right now in the smaller circle #3)
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1964 long fleet bed large rear window (project)(sold)
1965 chevy short fleet large rear window bagged (project)(thinking crew cab)
1965 chevy short fleet (driver/worktruck)
1937 chevy fenderless pu (use to be daily driver)
1983 MB turbo diesel (daily)
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Old 03-11-2013, 02:44 AM   #9
Ornery37
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Re: QuadraJet questions

o.k., I think I found it, but I need to get a mirror tomorrow to look. In that large tube/port off the back of the Vacuum break diaphragm might be the adjustment screw/allen.
Found this pic.
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1964 long fleet bed large rear window (project)(sold)
1965 chevy short fleet large rear window bagged (project)(thinking crew cab)
1965 chevy short fleet (driver/worktruck)
1937 chevy fenderless pu (use to be daily driver)
1983 MB turbo diesel (daily)
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Old 03-11-2013, 12:38 PM   #10
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Re: QuadraJet questions

You are correct. The diaphragm is a vacuum break (or choke pull-off) and the adjustment is in the center of the back.
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Old 03-11-2013, 10:51 PM   #11
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Re: QuadraJet questions

I don't know but isn't that the spot the plug would go for one of them electronic qjet carbs???

[never had one]
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Old 03-11-2013, 10:55 PM   #12
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Re: QuadraJet questions

yep here is a pic



and im 90% sure they don't work right without that thingy working, can't just unplug it and go like a reg carb.

you got the wrong carb by mistake or the info you gave them said you needed that.



pic also show its has a TPS
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Old 03-11-2013, 11:04 PM   #13
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Re: QuadraJet questions

Here is where I got mine, pics above is it, for my Buick, came set up ready to roll, just bolted on and went. even with a core charge, you could resell their work for a profit.

http://www.nationalcarburetors.com/
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