Fuel line plumbing - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 08-03-2006, 01:09 PM
Registered User
 
Join Date: Oct 2005
Location: So Cal
Posts: 7
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Fuel line plumbing

Ok, I know there's other posts on this topic but I'm still confused. I have a brand new 383 going into My 74 Nova with a hi-volume mechanical fuel pump. the original fuel system had three lines - one from the tank to the pump (then to carb), a second smaller line from the pump back to the tank. and a third line from the carb to the charcoal cannister and then back to the tank. Which of these lines can I elliminate? My new fuel pump only has provisions for one line from the tank and one to the carb. All original emmisions equip has been removed.

Thanks for the help!

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 08-03-2006, 03:10 PM
Siggy_Freud's Avatar
Hotrodders.com Moderator
 
Last photo:
Join Date: Dec 2003
Location: Portland, Oregon
Age: 29
Posts: 2,371
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Well you can eliminate the charcoal canister line if nessesary. You also dont NEED a return line to the tank but if your using a high volume pump it would probably be a good idea.
__________________
Bringing history and technology together.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 08-04-2006, 05:20 PM
Member
 
Join Date: Oct 2004
Location: Los Angeles
Posts: 173
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by Siggy_Freud
Well you can eliminate the charcoal canister line if nessesary. You also dont NEED a return line to the tank but if your using a high volume pump it would probably be a good idea.
He said his pump only has provision for a line from the tank and a line to the carb so he can't hook up a return line unless he uses a bypass regulator and plumbs a return line from there. Which I agree is a good idea.

Before I changed my setup to one with a return line, I was plagued with vapor lock problems. I am using a high volume electric pump, not a mechanical one so I am not sure if the same conditions would exist.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 08-05-2006, 09:24 AM
Registered User
 
Join Date: Oct 2005
Location: So Cal
Posts: 7
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Ok, so I can loose the charcoal cannister but I should keep the return line with the use of a regulator, right? And this is to make sure that the system can breathe well enough? thanks for the help!
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 08-05-2006, 12:20 PM
pmeisel's Avatar
Glad the Jeep is on the road
 
Last wiki edit: How to identify a Ford V8
Join Date: Jan 2004
Location: Meridian MS & Vermilion Ohio
Age: 58
Posts: 814
Wiki Edits: 8

Thanks: 0
Thanked 0 Times in 0 Posts
On jeep the return line to the tank is tee-ed out of the fuel filter. This is primarily to prevent any possibility of vapor lock which was a problem on some of those vehicles. You could do this without much trouble.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 08-07-2006, 09:13 AM
Member
 
Join Date: Oct 2004
Location: Los Angeles
Posts: 173
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by Chris_K
Ok, so I can loose the charcoal cannister but I should keep the return line with the use of a regulator, right? And this is to make sure that the system can breathe well enough? thanks for the help!
OK....part of what I am going to say is conjecture on my part so I am not positive it is totally accurate. But I think what happens with a high volume pump is that at other than full throttle conditions it is trying to pump way more fuel than is required. With the pump trying to push more fuel than is needed, my thinking is that this heats up the fuel, potentially promoting vapor lock.

With a bypass regulator, the excess fuel is just shunted back to the tank keeping it cool and eliminating any possible vapor lock problems.

As I said earlier, this is probably more true with a high volume electric pump than a mechanical one because a mechanical pump is tied to engine speed whereas an electric pump puts out the same no matter what the engine speed is.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 08-07-2006, 09:30 AM
Registered User
 
Last photo:
Join Date: Nov 2004
Location: Cali
Posts: 994
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
[QUOTE=Chris_K]Ok, I know there's other posts on this topic but I'm still confused. I have a brand new 383 going into My 74 Nova with a hi-volume mechanical fuel pump. /QUOTE]

What fuel pump are you using? The pump will only be as good as the supply line will allow, so I would consider replacing the stock line with something larger.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Plumbing new fuel system william27103 Engine 13 06-24-2005 01:36 PM
fuel return line Q nova 1 kenobi Engine 6 03-13-2005 05:25 PM
fuel line advice needed mike bryan Engine 4 12-04-2004 09:14 AM
Dual fuel line clearance question. western star Engine 2 10-03-2004 04:43 PM
Body Line Man586 Body - Exterior 6 08-20-2004 08:24 AM


All times are GMT -6. The time now is 12:49 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.