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Old 06-10-2018, 09:49 PM   #1
AcampoDave
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Quadrajet question

I have a vacuum port on the top backside of the carb that's capped and a line that's capped. The line goes to manifold vacuum and the other branch on it runs the climate control on my Caddilac. The motor is a 472. I assume the capped ends should be united by a hose right? Also, what is the purpose of the port on the carb? Thanks
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Old 06-11-2018, 11:59 AM   #2
Dead Parrot
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Re: Quadrajet question

Q-Jets were installed on a wide range of vehicles. Not at all uncommon for a port to be plugged from the factory or after a carb rebuilt.

If the line with the capped T is otherwise working, the T could be a PO's answer to mis-matched hose sizes or the only hose connector available at the time. Or could be for something since removed.

If the climate control is working, I would replace the T with the appropriate connector and call it good and just leave the carb port capped.
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Old 06-11-2018, 01:06 PM   #3
andyh1956
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Re: Quadrajet question

That should be a vent port to vent vapor of some type over into the carb.
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Old 06-11-2018, 07:09 PM   #4
AcampoDave
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Re: Quadrajet question

Quote:
Originally Posted by andyh1956;8279good 307
That should be a vent port to vent vapor of some type over into the carb.
yeah? I better have a look at the bottom of the air filter housing and see if there's an open hose barb under there.
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