Need approval of vacuum lines to weber 38 - JeepForum.com
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post #1 of 67 Old 09-27-2019, 05:42 PM Thread Starter
delirious1
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Need approval of vacuum lines to weber 38

Was browsing the facebook CJ7 page and noted someone ask about vacuum lines on the 258. So Since I didn't set mine up, I want to know if things look ok. No ERG. No CTO. Nutter bypass. HEI distributer. How do the vacuum lines look? Is there something I can do better?

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post #2 of 67 Old 09-27-2019, 05:50 PM
Shawn Watson
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It looks pretty bueno to me, bud. I don't care for fuel pressure regulators but if it's working well, so be it. Also, if you're seeing any kind of oil mist in the carb entrance, you may want to ditch the hose pulling PCV air from the filter base and just use a breather cap in the valve cover.

Other than that...


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Last edited by Shawn Watson; 09-28-2019 at 11:40 AM.
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post #3 of 67 Old 09-27-2019, 05:52 PM Thread Starter
delirious1
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Thanks Shawn. Respect your opinion. I've read lots of your posts.
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post #4 of 67 Old 09-28-2019, 11:04 AM
jeepdaddy2000
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I can't see well, but, be sure to use actual vacuum lines on any port that pulls manifold vacuum. Fuel/water line will collapse over time and you will have issues.


Insure the fuel pressure regulator is immobile. It looks a bit heavy and you don't want it bouncing around in there. You can build a simple bracket if you have to.



I really dislike gauze air filters (I know you are limited with the Weber). If you are going to run it you need to insure it is oiled. A dry element won't filter out anything smaller than rocks and tree branches. K&N sells a recharge kit. While a little expensive, it is simple and quick.

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post #5 of 67 Old 09-28-2019, 12:42 PM
Hoover7
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Your routing from the carb looks ok, but your charcoal canister isn't configured to work correctly- providing the diaphragm inside is intact and functional. Here are couple images I lifted from @keith460 for my reference files, and do a great job of describing the proper routing.

The fumes that collect in the charcoal canister (from the fuel tank and fuel bowl) should be 'purged' through the manifold vacuum port and burned along with the gasses from the PCV. To purge, the canister needs a vacuum signal, typically from the ported vac source on the weber carb. Once that diaphragm opens, the fumes held in the canister are pulled through the intake (via manifold vac) and burned in the cylinders.

One difference I see from his routing and yours is that you do not appear to have the TAC system, but isn't necessary since you have the Weber air cleaner. I have the same setup as you on my rig and run vacuum advance (distributor) from the same location.

Name:  Weber Vac routing.jpg
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Name:  Charcoal Cannister routing.jpg
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Hope this helps-
And big hat tip to Keith for the images.


Hoover

82 CJ7 Laredo Ltd, 258, T5, frame off resto/rebuild planned
83 CJ8 Scrambler, 360, T176, EFI, in progress
84 CJ7 Renegade, 258, T5, Weber 38, Cliffordized, Borla headers
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post #6 of 67 Old 09-28-2019, 08:27 PM Thread Starter
delirious1
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I am not sure what "C" weber additional ported vacuum source is located on the weber. Also My charcoal filter is factory from 1982. Do I need to replace it?


the factory air TAC cleaner goes to my distributor in the top picture you have there.

If I do this with the charcoal filter. I'll need a T splitter to configure "E" to canister purge
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post #7 of 67 Old 09-28-2019, 08:56 PM
Hoover7
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Quote:
Originally Posted by delirious1 View Post
I am not sure what "C" weber additional ported vacuum source is located on the weber. Also My charcoal filter is factory from 1982. Do I need to replace it?


the factory air TAC cleaner goes to my distributor in the top picture you have there.

If I do this with the charcoal filter. I'll need a T splitter to configure "E" to canister purge
D,

Your charcoal filter may work fine, won't know until you try it. Mine is from 1984 and still functions (knock on wood). If yours is defective, a comparable aftermarket canister can be purchased from DeLorean (of all places). The "C" refers to the ported vacuum source on your carb, and should connect to the canister, in the purge 'signal' port. From your carb, it appears it has a yellow/orange cap on it. I tried to circle it in your photo.

ported-vacuum_weber-38.jpg

Your distributor advance connection is fine- mine is run the same way for the manifold advance signal. And yes, to void (or expunge) the contents of the charcoal canister, you will need to add a 'T' between the PCV valve and the manifold vacuum inlet on the carb base plate, and connect a line to that port from the charcoal canister there.

Although some people mistakenly think the canister is some sort of power robbing enigma and disconnect it, it simply captures gas fumes and provides a way to burn those rather than letting un-burned fuel dissapate into the atmosphere, or more pointedly, stink up your garage/jeep with the smell of gasoline. It's a useful system IMHO.

Hoover

82 CJ7 Laredo Ltd, 258, T5, frame off resto/rebuild planned
83 CJ8 Scrambler, 360, T176, EFI, in progress
84 CJ7 Renegade, 258, T5, Weber 38, Cliffordized, Borla headers
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post #8 of 67 Old 09-28-2019, 09:16 PM Thread Starter
delirious1
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thank you. I'll try hooking things up. appreciate the pictures.
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post #9 of 67 Old 09-29-2019, 06:48 AM
BagusJeep
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ou don't say which fuel pump you are running. If mechanical or a solenoid type you do not need the FPR.
The filter is in there but it would better if more horizontal.
Hose should be limited to a few inches, to allow filter servicing. Safety hazard.

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post #10 of 67 Old 09-29-2019, 12:42 PM Thread Starter
delirious1
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mechanical. Fuel pump regulator isn't needed? I've read where the weber 38 needs about 3.5 PSI input.
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post #11 of 67 Old 09-29-2019, 01:19 PM
Hoover7
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I don't use a regulator on mine, either. The oem two-outlet fuel filter supposedly regulates the pressure as long as the return line is clocked at the 12:00 position. I'm also using a viton tipped needle and seat in my Weber 38 which was recommended to help control fuel flow better.

Hoov

82 CJ7 Laredo Ltd, 258, T5, frame off resto/rebuild planned
83 CJ8 Scrambler, 360, T176, EFI, in progress
84 CJ7 Renegade, 258, T5, Weber 38, Cliffordized, Borla headers
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post #12 of 67 Old 09-29-2019, 01:33 PM Thread Starter
delirious1
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if I use the carb bowl to canister, what's everyone using at the back port on the valve cover. I've seen what looks like a K&N filter
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post #13 of 67 Old 09-29-2019, 01:38 PM
Hoover7
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Post up some images if possible- I'm not quite tracking.

Hoov

82 CJ7 Laredo Ltd, 258, T5, frame off resto/rebuild planned
83 CJ8 Scrambler, 360, T176, EFI, in progress
84 CJ7 Renegade, 258, T5, Weber 38, Cliffordized, Borla headers
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post #14 of 67 Old 09-29-2019, 01:41 PM Thread Starter
delirious1
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called a valve cover breather.


https://www.amazon.com/Spectre-Perfo...=fsclp_pl_dp_8
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post #15 of 67 Old 09-29-2019, 04:09 PM Thread Starter
delirious1
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Got everything done. The cannister is connected. didn't notice any degradation in performance of the engine. I also removed the fuel regulator and it started right up. No problems. So thanks to all. I did find the valve cover breather like the one in the picture above. Everything looks nice.
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