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04-15-2014, 08:25 AM
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#1 |
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Registered User
Join Date: Oct 2013
Location: Falmouth me
Posts: 8
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69 GMC 402 Carb Vacuum Diagram?
Anyone have pics or a diagram for a 1969 GMC 402 Quadrajet 4Brrl with the vacuum lines? There is a vacuum port on the left side under the choke... trying to figure what that connects to? Thanks
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04-15-2014, 10:05 AM
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#2 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,703
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Re: 69 GMC 402 Carb Vacuum Diagram?
Welcome to the forum!!
Take a pic of your carb. Much easier for us to figure it out. |
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04-15-2014, 10:53 AM
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#3 |
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Registered User
 
Join Date: May 2013
Location: WEST PALM FLORIDA
Posts: 1,174
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Re: 69 GMC 402 Carb Vacuum Diagram?
Usaly there are 2 small vacuum ports one for the transmissions vacuum modulator , the other for the ignitions vacuum advance , the last stock Rochester quadrajet I worked on , on a stock 69 c10 with a 350 , the one forward or closest to the radiator was hooked to the transmission , that is opposite of the way most holleys attach theirs , not positive that it came that way
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68 Long Fleet , ly6 , turbo 350 , 3-5 drop , original paint , front discs 67 Small window , 7 foot bed , tweaked 6.0 LSX 2004R Medium Olive 58 Apache fleet , 235 , offy intake , dual exhaust , 4 on the floor , red/white 69 Long Fleet , Custom , 6.0, 4l60 , AC , Medium Olive |
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04-15-2014, 06:00 PM
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#4 |
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Registered User
Join Date: Oct 2013
Location: Falmouth me
Posts: 8
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Re: 69 GMC 402 Carb Vacuum Diagram?
Any advice on how to post a pic? Tried and it wants a URL. I took it w my phone. You must be able to upload somehow? Thanks
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04-15-2014, 07:16 PM
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#5 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,703
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Re: 69 GMC 402 Carb Vacuum Diagram?
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04-15-2014, 09:07 PM
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#6 |
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Registered User
Join Date: Oct 2013
Location: Falmouth me
Posts: 8
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Re: 69 GMC 402 Carb Vacuum Diagram?
Here is a pic of the vacuum line under the choke. Thank you
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04-15-2014, 10:03 PM
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#7 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,703
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Re: 69 GMC 402 Carb Vacuum Diagram?
That vac line is for vacuum to your charcoal canister which is located under your battery on the passenger side.
Here's a video that shows it. It's on a 71. I think your truck had one too. |
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04-16-2014, 06:55 AM
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#8 |
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Registered User
Join Date: Oct 2013
Location: Falmouth me
Posts: 8
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Re: 69 GMC 402 Carb Vacuum Diagram?
I've looked through everything and all the lmc / classic industry parts and i do not believe my 69 2500 came with a charcoal canister. Any other ideas? I do believe this to be the original carb. Is it possible that line just had a plug on it?
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04-16-2014, 08:10 AM
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#9 |
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Senior Member
Join Date: Aug 2003
Location: Conyers,Ga.
Posts: 7,287
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Re: 69 GMC 402 Carb Vacuum Diagram?
Does your air cleaner have port for vacuum? If your truck is 69 it should be a 396.
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04-16-2014, 09:15 AM
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#10 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,703
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Re: 69 GMC 402 Carb Vacuum Diagram?
What's the number on your carb?
First pic on here tells you where to look. http://www.crankshaftcoalition.com/w...4MV_carburetor |
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04-16-2014, 09:19 PM
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#11 |
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Registered User
Join Date: Oct 2013
Location: Falmouth me
Posts: 8
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Re: 69 GMC 402 Carb Vacuum Diagram?
Thanks everyone... I believe it is fur the vent on the air cleaner. I'm about 80% through the restoration and my air cleaner is missing the vent. Will post pics soon..this is going to be a sweet 69 resto mod.
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