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Changing Jets in the Weber 32-36

Last Updated: Feb 24, 2015
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I'm doing this post because I could not find any photographic reference for changing the jets. This was my first carburetor job and the first time I've adjusted a carburetor. If you can install the Weber, you can tune it. I literally did my final jet change on the side of the road. I did this for my 1989 B2200 Extended Cab. I do have an Air/Fuel Meter hooked up. It helps with fine tuning, but it's not necessary. I used the Redline Weber Carburetor Kit #K675 GE and the Weber Carburetor Adjustment Kit #701-DGV4. First off, take off the air cleaner assembly with a 10mm socket and ratchet or wrench and get access to the top of the carburetor. This is what you should be looking at:

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Separate the Choke Linkage (yellow circle). I used a screwdriver. Disconnect the Charcoal Canister Tube (pink circle), if you're using it. Remove the 6 screws that hold the top of the carburetor on (red circles). Once you remove the top of the carburetor and the gasket, this is what you'll see:
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The green circle is the Pump Jet. Factory is a Single Pump Jet at 50. I didn't mess with that. This piece is responsible for dumping fuel into the barrels under acceleration.
The pink circle contains the Air Correctors. They are both 170 from the factory. I did swap out the primary, for giggles, but went back to the factory 170. The red circle contains the Main Jets. The left one is for the Primary Barrel and the right is the Secondary Barrel. Factory they are both 140. If your truck idles fine but runs lean at cruising speed, the jet on the left needs to be bigger. For my Seattle emissions test, I passed with a 145 for the Primary Jet. For ideal running conditions, I needed a 155. If the Mixture Screw is more than 2 turns out or less than 1/2 turn out, the Primary Idle Jet needs swapped out:
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The Primary Idle Jet is tucked into the brass fitting in the red circle. This is on the passenger side of the Carburetor, forward of the Choke. The factory Primary Idle Jet was a 55. I had to swap out for the 65. I'm not sure what the Secondary Idle Jet governs:
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The Secondary Idle Jet lives under the brass fitting on the driver side of the carburetor (red circle). Factory size is 50.

Tuning the Weber 32-36 does require a lot of trial and error, but it's entirely doable, even for a novice. Hope this has helped. Finally, here are the tools needed to swap out all these jets.
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Created By: 12gamakeover

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Cusser avatar
Cusser   +1y
Nice write up.

I got the Redline Weber 32/36 DGEV kit in late 2005 for my 1988 B2200. All I know about mine is that my primary idle jet is 52 and my secondary is 45. I've never had it apart to check the other jets, mine runs good, and I also have AC, and aftermarket cruise control grafted onto the Weber's "cam".
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