Pre 84 Trucks 1st gen pickups

1983 HAC valve connection help, please.

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Old Feb 8, 2010 | 07:33 PM
  #1  
slowzuki2003's Avatar
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1983 HAC valve connection help, please.

Just picked up a clean '83 for $400.00 and am slowly putting it back together. I started with a bucket full of vacuum fun and am in need of help connecting my HAC valve. I have the diagram and am confused as to where each hose connects to the carb and the distributor. It appears that there is a check valve and a "T" where it connects to the distributor? If someone can please post pics or a link to pics of this it would be greatly appreciated. Thanks
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Old Feb 15, 2010 | 03:24 PM
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Pumpkinyota's Avatar
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From: Sonora, CA (Central Sierra)
Ok, here's some general carb resources:

http://www.pirate4x4.com/forum/showthread.php?t=249626

http://www.bluebassdesign.com/boonin/carb_faq/

Some more diagrams:

This first one was Canada Only, no HAC. The next two are federal and Canada.





Note the circled "A" showing where the HAC would connect on both the distributor side and the HAC side.


Pics of my junk. Please excuse the mess, I am in the middle of a major rebuild and complete re-wire:

The bottom port on the HAC is the one that goes to the distributor VA, to a "T" in front of the check valve.





The rest just line up exactly to the three ports on the carb, here are some pics:







I hope this is helpful, let me know how it goes!
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