Using Power Brake Vacuum For Fuel Evap Canister - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep CJ Forum > Using Power Brake Vacuum For Fuel Evap Canister

Ruffstuff Axle Simple Swap Kit!Ruffstuff's Monster Shock Brackets!Even Better Heim Pricing! From Ruffstuff

Reply
Unread 07-19-2014, 10:42 PM   #1
WindKnot
Web Wheeler
 
WindKnot's Avatar
1977 CJ7 
 
Join Date: Mar 2011
Location: Kaibab Plateau, Northern Arizona
Posts: 3,099
Using Power Brake Vacuum For Fuel Evap Canister

I don't have power brakes. Moving the vacuum source for the Evaporative Canister to the Power Brake port would clean things up a lot.

Can anyone think of a reason not to go this route?

__________________
I'd rather be lost on the trails than found at home!

Phoenix Rising- A Flame Off Restoration? http://www.jeepforum.com/forum/f8/ph...ation-1807257/
WindKnot is offline   Reply With Quote Quick reply to this message
Unread 07-19-2014, 11:04 PM   #2
JeffreyCharles
Registered User
1976 CJ5 
 
Join Date: Feb 2009
Location: Vallejo, CA
Posts: 616
Not having a means of purging the evap canister? Or is it already gone?
__________________
Jeffrey Charles
http://jeep.smallcraft.net/
JeffreyCharles is offline   Reply With Quote Quick reply to this message
Unread 07-20-2014, 01:35 AM   #3
bruteboy
Registered User
 
Join Date: May 2010
Location: british columbia ca
Posts: 484
it may cause driveability issues as it would act like a vac leak when purging. it should be tee'd into the pcv line.
bruteboy is offline   Reply With Quote Quick reply to this message
Unread 07-20-2014, 05:40 AM   #4
Mike Romain
Registered User
1986 CJ7 
 
Join Date: Nov 2007
Location: Off the Grid in Chester Grant, Nova Scotia, Canada
Posts: 13,928
The purge is just looking for manifold vacuum so that should work fine as long as the trigger is still ported.
__________________
Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
Mike Romain is offline   Reply With Quote Quick reply to this message
Unread 07-21-2014, 09:35 AM   #5
WindKnot
Web Wheeler
 
WindKnot's Avatar
1977 CJ7 
 
Join Date: Mar 2011
Location: Kaibab Plateau, Northern Arizona
Posts: 3,099
Thanks guys. I looked again and then I was "inspired" to look at the FSM to see what it said. (well, duh, dummy! ) You guys are right, all it wants is a vacuum source.

It wasn't set up correctly when I bought it. In fact the fuel return line had somehow disappeared as well. Since I'm rebuilding and considering a future move to FI I want to restore the return line. The Evap was there but the original air cleaner was gone and the purge hose wasn't hooked up to anything.

The book says originally the purge hose was just hooked into the air cleaner horn; it doesn't require that much of a vacuum at all. I think you're right in that although the power brake port would establish the vacuum, the airflow might be too large and cause problems.

Thanks for the sounding board.
__________________
I'd rather be lost on the trails than found at home!

Phoenix Rising- A Flame Off Restoration? http://www.jeepforum.com/forum/f8/ph...ation-1807257/
WindKnot is offline   Reply With Quote Quick reply to this message
Unread 07-21-2014, 10:03 AM   #6
Mike Romain
Registered User
1986 CJ7 
 
Join Date: Nov 2007
Location: Off the Grid in Chester Grant, Nova Scotia, Canada
Posts: 13,928
Quote:
Originally Posted by WindKnot View Post
Thanks guys. I looked again and then I was "inspired" to look at the FSM to see what it said. (well, duh, dummy! ) You guys are right, all it wants is a vacuum source.

It wasn't set up correctly when I bought it. In fact the fuel return line had somehow disappeared as well. Since I'm rebuilding and considering a future move to FI I want to restore the return line. The Evap was there but the original air cleaner was gone and the purge hose wasn't hooked up to anything.

The book says originally the purge hose was just hooked into the air cleaner horn; it doesn't require that much of a vacuum at all. I think you're right in that although the power brake port would establish the vacuum, the airflow might be too large and cause problems.

Thanks for the sounding board.
You have the old fashioned canister then with no purge valve on it. It would cause a vacuum leak for sure if hooked to manifold vacuum. I have seen folks just drill a hole in the snout of the intake and solder in a copper tube at right angles to the airflow for picking up the purge line. They flared the end of the tube so it fit tight in the hole from the top. Even an epoxy like JB weld would likely hold the tube in place, but solder would be best.
__________________
Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
Mike Romain is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools






Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.