FUEL LINE & TRANS LINE SIZE/TYPE - 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> Hotrodding Basics
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 11-29-2005, 01:22 PM
72NOVA454
 
Last photo:
Join Date: Nov 2004
Location: chicago area
Age: 51
Posts: 922
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts
FUEL LINE & TRANS LINE SIZE/TYPE

help

I am rebuilding my BB chevy in my 72 nova and will be running new automatic trans cooling lines to my new radiator mounted trans cooler. what type and size lines should I run? I am thinking about steel lines 5/16" and making my own bends with flared ends. Also I am putting in a new fuel pump and carburetor and need ideas of what type of fuel line to run from the mechanical block mounted pump to the carb. the carb will either be a Holley 750 or 800 double pumper. thanks.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 11-29-2005, 03:48 PM
techinspector1's Avatar
Senior Curmudgeon
 
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Hemet, California, USA
Age: 72
Posts: 13,321
Wiki Edits: 326

Thanks: 839
Thanked 1,153 Times in 952 Posts
I've never had a problem running 5/16" lines for the cooler lines. I would, however, incorporate a short length of cooler line hose in both the supply and return lines (maybe 6" or so). If you think about it, the radiator/cooler is rigidly mounted to the core support, but the engine/trans is on rubber mounts so it can twist slightly in the car, so short lengths of hose will prevent fatigue and subsequent rupture in the steel lines. I'd also include a filter in one of the lines while I was doing it.

If you're using the stock fuel lines from the tank to the pump, I see no need for anything larger than 3/8" hard line from the pump to the carb. Incorporate a fuel pressure gauge at the carb inlet and monitor for 5 1/2 to 6 psi max at full throttle power. Add a regulator if necessary.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 11-29-2005, 03:52 PM
72NOVA454
 
Last photo:
Join Date: Nov 2004
Location: chicago area
Age: 51
Posts: 922
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts
Dear TechInspector

is there a problem if I get a high volume high pressure fuel pump that delivers 130 GPH at 9 PSI instead of the standard 5-7 PSI. I'm using a Holley 4BBL street series carb.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 11-29-2005, 04:05 PM
techinspector1's Avatar
Senior Curmudgeon
 
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Hemet, California, USA
Age: 72
Posts: 13,321
Wiki Edits: 326

Thanks: 839
Thanked 1,153 Times in 952 Posts
The needle and seat in the carb can only control pressure into the bowl up to about 6 psi. Anything over that pressure will overpower the system and flood the motor with fuel.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 11-29-2005, 05:31 PM
BIGSKY's Avatar
See project in Photo Album
 
Last photo:
Join Date: Sep 2005
Location: Montana
Posts: 203
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by leejoy
I am thinking about steel lines 5/16" and making my own bends with flared ends.
If you don't already have a flare tool, I suggest the Ridgid tool, #345. It doesn't come with the double flare dies, you have to buy those separate, but it is the way to go. I just went through this with some custom brake lines. I got my tool at Home Depot for $37.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 11-29-2005, 07:43 PM
72NOVA454
 
Last photo:
Join Date: Nov 2004
Location: chicago area
Age: 51
Posts: 922
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts
bigsky

what is a double flaring tool? i know what a regular flaring tool is and enough about flare fittings, etc but not about a double flaring tool.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 11-29-2005, 07:57 PM
techinspector1's Avatar
Senior Curmudgeon
 
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Hemet, California, USA
Age: 72
Posts: 13,321
Wiki Edits: 326

Thanks: 839
Thanked 1,153 Times in 952 Posts
Quote:
Originally Posted by leejoy
bigsky

what is a double flaring tool? i know what a regular flaring tool is and enough about flare fittings, etc but not about a double flaring tool.
You must double flare brake lines because of the pressure involved. It will not be necessary with trans/fuel lines.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 11-29-2005, 11:59 PM
Member
 
Last photo:
Join Date: May 2003
Location: Shreveport LA
Age: 65
Posts: 5,103
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
http://www.carcraft.com/howto/50919/index.html
Reply With Quote Quick reply to this message

Recent Hotrodding Basics 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:
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
fuel return line Q nova 1 kenobi Engine 6 03-13-2005 06:25 PM
What Fuel line airman_turtle Engine 4 03-10-2005 04:44 PM
Dual fuel line clearance question. western star Engine 2 10-03-2004 05:43 PM
Body Line Man586 Body - Exterior 6 08-20-2004 09:24 AM
fuel line montea Engine 3 04-21-2004 04:59 AM


All times are GMT -6. The time now is 11:27 PM.


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.