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Unread 12-20-2009, 02:31 PM   #1
RogueWrangler
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Weber Carb Install - What to do with the vacuum hoses?

I'm currently installing a new Weber 34 Carburetor on my 1990 Jeep Wrangler. So far I have only removed the old carburetor from the engine along with all the vacuum hoses and electrical components. When I look at the Weber Carburetor there are a lot less vacuum hoses that need to be hooked up. What do I do with them? Are they no longer needed?

Also, Do I need to buy a fuel pressure regulator? The installation instructions for the Weber said that you need to add one if the fuel pressure was greater than 3.5 psi, but will I be fine otherwise.

Thank you in advance for the help.

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Unread 12-20-2009, 03:46 PM   #2
bigsquat
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i had these diagrams on my computer,im not sure if they are relevant. i had a 90 and was going to try to get the vacum lines right but i gave up and sold it. california is tuff on changing things under the hood.
4_2_vac_lines.jpg   82mod-1vac-lines.jpg   vacuum-20diagram.jpg   vacuum_diagram3.jpg  
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Unread 12-21-2009, 03:58 PM   #3
RogueWrangler
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Thank you for the response. I'm sure these diagrams are going to help. Anyone know about the fuel pressure regulator?
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Unread 12-21-2009, 04:43 PM   #4
giggityjeeper
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you should end up with 3 or 4 vac lines after install, everythign else can go carb included.....depending on how you do it, I capped my egr some peole keep it....

the diagrams you have there are for carter install vac lines,....there is agood one for the weber I can never find it when I need it, but search these forums, this has been done lots

use this link it is the one I used mostest...

awsopme write up

http://www.jeepforum.com/forum/f12/w...ite-up-382309/

I DID NOT KEEP STOCK AIR CLEANER,

yes a fuel pressure regulator is required or it wont run right..remember to CAP off the lines you removed.

Also recommend nutter and the team rush mod...should get ya a good running heep.
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Unread 12-21-2009, 05:30 PM   #5
bigsquat
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there is one there for the weber. just be sure to use ported vacum for your distributer and not full vac. if at idle the port has vacum at idle then thats the wrong port. the egr isnt a bad thing either ,it cools of the combustion chamber and cuts down on nitros oxide. probably help with pinning as well but who knows. im sure on of the smog guys here will chime in.
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Unread 12-21-2009, 05:34 PM   #6
bigsquat
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the regulaters are cheep, 20 bucks, see the numbers on it for dialing in the pressure.
fuel-p.jpg  
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Unread 12-21-2009, 06:54 PM   #7
RogueWrangler
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Thank you. That was a huge help. I've been using that write up and it as been very helpful. I'm picking up a fuel pressure regulator tomorrow and I'm looking into the nutter bypass. From what I've seen so far I don't think it will be too difficult.
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Unread 12-21-2009, 07:52 PM   #8
Bubba Ray
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Get the Holley fuel regulator, the rest are not so good.
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Unread 12-23-2009, 10:13 AM   #9
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2x on the holly, it's like 10 bucks more, but I've heard so many people say they got another brand and after a few weeks it either expolded or leaked terribly. I put the holley 12-804 on mine(make sure you get the barb fittings too and a gauge) and it works great. I will admit though I have seen a few people say they runb without one just fine.
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