Author Topic: Manifold Vacuum - where is it?  (Read 1446 times)

gimmea250swb

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Manifold Vacuum - where is it?
« on: June 13, 2019, 07:23:32 PM »
I'm sorry for the novice question but I've never tuned a carb before.  Where do I hook up the vacuum pressure meter?  I've got a 3259-1 carb.  I see new carbs have a nipple you can access directly on the carb but it doesn't look like the 3259 has one.  Do I hook it up to the actual manifold?  My guess is I pull the 1" hose coming off the front driver's side on the manifold.  Is this correct or is there an easier place?


Coralsnake

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Re: Manifold Vacuum - where is it?
« Reply #1 on: June 13, 2019, 07:36:15 PM »
Only if you want engine coolant to spray out. Thats a heater hose.

You might have an accessible port somewhere else on the manifold

gimmea250swb

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Re: Manifold Vacuum - where is it?
« Reply #2 on: June 13, 2019, 08:08:32 PM »
Ha!  I should’ve looked.  The hose goes through the firewall.  How about is one to the rear?

zray

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Re: Manifold Vacuum - where is it?
« Reply #3 on: June 14, 2019, 05:11:50 AM »
you should have several options, for example , the pcv hose should be hooked up to manifold vacuum.

Z.

J_Speegle

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Re: Manifold Vacuum - where is it?
« Reply #4 on: June 15, 2019, 04:31:26 PM »
Yes you could use that unused rear port after removing the plug and installing a correct nipple fitting for the rubber tubing to the gauge then replacing plug after your done adjusting things
Jeff Speegle- Mustang & Shelby detail collector, ConcoursMustang.com mentor :) and Judge