Newbie Gas Line Help - JeepForum.com

Reply
 
LinkBack Thread Tools
post #1 of 26 Old 07-13-2013, 09:33 AM Thread Starter
Jeep149
Registered User
1982 CJ7 
 
Join Date: Mar 2013
Location: springville
Posts: 35
Newbie Gas Line Help

Hey guys I have tried to search for this on this forum, but no luck. So being excited about my build and tearing things apart I forgot to take pics of the gas lines. My question is, I have bought a new return line and one that goes to the fuel pump. I thought it might have a third line?? and if so what is that one called and where does it go? Thanks in advance

Jeep149 is offline  
Sponsored Links
Advertisement
 
post #2 of 26 Old 07-13-2013, 10:12 AM
Skerr
Registered User
1985 CJ7 
 
Join Date: Sep 2008
Location: White Springs
Posts: 9,478
Ah yes, the excitement... like a Redfish exploding on a Zara Spook at daylight under the mangroves! Well, maybe not, but I get it. Pretty sure you will have just a supply line and a return line, and if you are reusing the factory lines, they should determine where they go simply by their shape. I'm not sure, as my Jeep doesn't have a charcoal canister, but you might have a line venting that as well. I want to say the charcoal canister line was green(?). Guess I'm no help! CRS, you know. Hang on, somebody will answer this question correctly.

Kerrdog
Go Fish! <*////><

But the right word at the right time... "Hey, give me a little hug!" That's the difference between lightning and a harmless lightning bug!
Skerr is offline  
post #3 of 26 Old 07-13-2013, 10:16 AM
austincj
Registered User
1981 CJ7 
 
Join Date: Oct 2012
Location: Austin
Posts: 9
My 81 CJ7 has a return line coming from the third port of the fuel filter.
See this post here for a picture of the proper fuel filter positioning:
http://www.jeepforum.com/forum/f8/fu.../#post11907591


Note, I've seen some posts saying that the return line goes through the carbon canister. I'm pretty sure that this is not correct. At least in my 81 (non-california version), the return line goes directly to the tank.

Regards,
-David
austincj is offline  
post #4 of 26 Old 07-13-2013, 10:17 AM
austincj
Registered User
1981 CJ7 
 
Join Date: Oct 2012
Location: Austin
Posts: 9
Oh, and I have another return coming from the canister.
austincj is offline  
post #5 of 26 Old 07-13-2013, 10:24 AM
Skerr
Registered User
1985 CJ7 
 
Join Date: Sep 2008
Location: White Springs
Posts: 9,478
Yes, return comes from the fuel filter. The charcoal canister is for venting the fuel bowl on the carb, not for the return line.

Kerrdog
Go Fish! <*////><

But the right word at the right time... "Hey, give me a little hug!" That's the difference between lightning and a harmless lightning bug!
Skerr is offline  
post #6 of 26 Old 07-13-2013, 10:58 AM
austincj
Registered User
1981 CJ7 
 
Join Date: Oct 2012
Location: Austin
Posts: 9
Thanks for the correction.
I found the following link helpful in explaining the purpose of the canister:
http://home.sprynet.com/~dale02/evaporat.htm

So I guess the line between the canister and the tank is more of a "supply" line, but only passes evaporated vapors.

In summary, on my CJ, there are three lines (that I'm aware of) between the tank and the engine compartment:
1) Supply line to the fuel pump.
2) Return line from the filter
3) "Vapor line" (terminology?) between the canister and the tank.

Regards,
-David
austincj is offline  
post #7 of 26 Old 07-13-2013, 11:44 AM Thread Starter
Jeep149
Registered User
1982 CJ7 
 
Join Date: Mar 2013
Location: springville
Posts: 35
Great info thanks guys! I'm still running the charcoal canister so I guess I will be needing the "vapor line"
Jeep149 is offline  
post #8 of 26 Old 07-13-2013, 11:50 AM Thread Starter
Jeep149
Registered User
1982 CJ7 
 
Join Date: Mar 2013
Location: springville
Posts: 35
Anyone have problems with vapor lock without running the canister? or any other problems?
Jeep149 is offline  
post #9 of 26 Old 07-13-2013, 01:48 PM
Skerr
Registered User
1985 CJ7 
 
Join Date: Sep 2008
Location: White Springs
Posts: 9,478
You won't have vapor lock if you bypass the canister. The canister is solely for helping to eliminate gasoline vapors from escaping into the atmosphere by returning them to the fuel system.

Kerrdog
Go Fish! <*////><

But the right word at the right time... "Hey, give me a little hug!" That's the difference between lightning and a harmless lightning bug!
Skerr is offline  
post #10 of 26 Old 07-13-2013, 05:59 PM Thread Starter
Jeep149
Registered User
1982 CJ7 
 
Join Date: Mar 2013
Location: springville
Posts: 35
Awesome! Goodbye canister! thanks for all the help!
Jeep149 is offline  
post #11 of 26 Old 07-13-2013, 09:09 PM
texasdave
Web Wheeler
 
texasdave's Avatar
1980 CJ7 
 
Join Date: Dec 2007
Location: Killeen
Posts: 1,312
A bad canister will cause it run poorly. As per Adventures under the hood website.
texasdave is offline  
post #12 of 26 Old 07-13-2013, 09:18 PM
CSP
Registered User
 
Join Date: Aug 2002
Location: Colorado
Posts: 15,405
Quote:
Originally Posted by Skerr View Post
You won't have vapor lock if you bypass the canister. The canister is solely for helping to eliminate gasoline vapors from escaping into the atmosphere by returning them to the fuel system.
No, that's not completely true. The canister and the line also act as the vent for the tank. As gas is pumped out of the tank air must enter the tank or a vacuum will be created in the tank. The canister act as a vent to supply replacement air and it captures fumes when there are temperature changes, natural evaporation of gas, etc.

There's really no good reason not to use it.
CSP is offline  
post #13 of 26 Old 07-13-2013, 09:27 PM
Skerr
Registered User
1985 CJ7 
 
Join Date: Sep 2008
Location: White Springs
Posts: 9,478
Quote:
Originally Posted by CSP View Post
No, that's not completely true. The canister and the line also act as the vent for the tank. As gas is pumped out of the tank air must enter the tank or a vacuum will be created in the tank. The canister act as a vent to supply replacement air and it captures fumes when there are temperature changes, natural evaporation of gas, etc.

There's really no good reason not to use it.
You're right, CSP. Thanks for the correction. My bad...

OP, note*- if you eliminate the canister you will need to provide an air vent. I don't have a canister on my 5, because it didn't have one when I got it. My 7 does have a canister. The canister doesn't hurt performance in any way, and it does prevent gas vapors from entering the air, which is a major source of air pollution. It's easy to rebuild it. Just food for thought...

Kerrdog
Go Fish! <*////><

But the right word at the right time... "Hey, give me a little hug!" That's the difference between lightning and a harmless lightning bug!
Skerr is offline  
post #14 of 26 Old 07-14-2013, 12:49 AM
BagusJeep
Registered User
1981 CJ7 
 
Join Date: Jul 2009
Location: Bali
Posts: 5,244
Us lucky other worlders only had two lines and a vent in the gas cap (i.e. a small hole) and no roll over or check valves.

If you go two lines you will need a vented gas cap. Somewhere in the mid west can supply them I recall.

BagusJeep lives in Bali.

1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1951 Willys CJ3A/MB/M38 - Little Willy
1995 Cherokee 4.0 - CHEROKEE
BagusJeep is offline  
post #15 of 26 Old 07-14-2013, 06:55 AM
keith460
Jeep. There's Only One
 
keith460's Avatar
1984 CJ7 
 
Join Date: Jan 2007
Location: Doylestown, PA
Posts: 6,277
Quote:
Originally Posted by Jeep149 View Post
Awesome! Goodbye canister! thanks for all the help!
That's a mistake right there!

Removing the canister, you will experience the joys of smelling like raw fuel every time you drive your Jeep. But, if that is what you like, go for it.

Fuel tank venting, Roll Over Valves, fuel Check Valves, Return Lines, Charcoal Canister and dual outlet Fuel Filters are all designed for a purpose. For the purpose of delivering fuel to the engine and returning unused back to the tank safely without you having to smell it.










.
1984 CJ-7 Renegade
__________________

Restoration Thread:http://www.jeepsunlimited.com/forums...d.php?t=434226
keith460 is online now  
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.



Email Address:
OR

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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome