86 CJ-7 Carb

Try your local NAPA store, they have replacements readily available. FWIW, if it was me and your local smog laws permit it, I'd toss the stock carb in favor of the two barrel Weber K551. Check out Collins Brothers web site.

I just put on a Weber k-551 on my 86 cj7 that I bought from Collins bros. for about $300. now my jeep starts great cold or hot, idles and stopped blowing out black smoke. one thing I had to add on my jeep was a holley low fuel pressure regulator (around $25 from jegs.com) because the weber need under 3.5 psi fuel pressure and my jeep was 5.5 psi so I set the regulator at 2.5 psi. when the weber was running with 5.5 psi the carb was bleeding off the excess pressure into the carb and causing it to blow black smoke when I started it when it was hot. carmine

Why not just put a rebuild kit in yours?

The kits are only about $20.00 and are easy to put in. They come with good instructions.

Mike

"Kenneth Reichenbach Jr." wrote:

I can't see how what you are describing works...

The only way a stock system will build up any pressure in the gas lines is if the plumbing is done incorrectly.

Properly plumbed, the gas filter in front of the carb has two outlets. One outlet, the center one, goes to the carb and when the carb float shuts off the gas flow, the excess gas gets pumped back to the gas tank via the return line or the top outlet on the filter.

This keeps the gas pressure down to close to 0 psi. The carb will actually run with a gravity feed from a gas can sitting on the hood if all else fails for a trail fix.

Now if you have blocked the return line, then the pump can build up pressure, but it also will vapor lock like a bugger in really hot weather.

Mike

Jet wrote:

My local AutoZone had a reman 2bbl for my `79 I-258, $ 115 plus core. Works great. YMMV.

Actually, they operate around 3-5 psi if I remember correctly. There is an orifice in the return nipple of the filter that restricts fuel flow back to the tank.

Ok, I have noticed the filter bypass tube will blow through when the center one to the carb is dirty and blocked, but didn't think that much pressure was needed. Seemed like the difference between the tube sizes for a restriction, hard to tell just blowing air though.

Now I see why one might need a regulator, thanks.

Gent below sounds like he blocked the return line. The filter will bleed off to 0 psi almost instantly otherwise.

I wonder if you could drill out the restriction in the filter return line to lower the pressure fast and cheap or if it just a tube size restriction?

Mike

Yeah, it's more than just the difference in tube sizes. The restrictor is quite a bit smaller than the actual tube.

I don't see why you couldn't do that. It would probably work fine.

I have a reman. Carter carb I'll sell you. It is on an '80 258 in a CJ. I put it on a year ago, drove it for a month, then found a great deal on a V8. Pulled the whole engine and it has been in the garage since. It is a reman. from Autozone, and I have the receipt around here somewhere.... I don't know if your '86 has the computer-controlled carb or not. If not, this should work fine. Drop me an email if you are interested.

Cheers,

Ryan snipped-for-privacy@earthlink.net

Might want to do it in steps though. Not enough pressure could be a real problem.

I kinda had that figured. I was thinking on seeing the size which holds the 5 lb and doing some fluid math to open it up a certain percent and see what that does if I ever needed to do it. Or if anyone ever asks I can suggest that....

Thanks again.

Mike